NAVY GUN-TYPE AMMUNITION - bulletpicker.combulletpicker.com/pdf/OP 2215, Navy Gun Type Ammunition (1972).pdf · navord op 2215 volume 1 second revision technicalmanual navy gun-type

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NAVORD OP 2215 VOLUME 1 SECOND REVISION

TECHNICALMANUAL

NAVY

GUN-TYPE

AMMUNITION

FOR OFFICIAL USE ONLY

THIS PUBLICATION SUPERSEDES

NAVORD OP 2215, VOLUME 1, FIRST REVISION

DATED 1 MARCH 1967

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Published by Direction of Commander, Naval Ordnance Systems Command

15 JANUARY 1972


LIST OF EFFECTIVE PAGES

Page Issue Page Issue

Title A Change Record/ Change Record-2 (blank)

Foreword/ Foreword-2 (blank)

i thru xviii l-1 thru l-10 2-1 thru 2-42 (blank) 3-1 thru 3-124 (hlanlc) 4-1 thru 4-52 (blank) 5-1 thru 5-6 (blank)

Original Original

Original

Original Original Original Original Original Original Original

6-l thru 6-6 (blank) Original 7-1 thru 7-4 Original 8-l thru 8-6 Original 9-l thru 9-14 (blank) Original 10-l thru lo-12 Original A-l thru A-6 (blank) Original B-l thru B-12 Original C-l thru C-34 Original D-l thru D-10 (blank) Original E-l thru E-10 (blank) Original F-l thru F-8 Original G-l thru G-4 (blank) Original

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N/WORD OP 2215 VOLUME 1 SECOND REVISION

CHANGE RECORD

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Change Record/Change Record-2 blank

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FOREXWRD

NAVORD OP 2215, Volume 1, Second Revision describes Navy gun-type ammunition fired from guns over .60 caliber, and includes items closely associated with gun ammunition. This publication has been prepared to provide trained and authorized personnel with general and specific information concerning the description, identification, and use of gun arrununition. The Second Revision of NAVORD OP 2215, Volume 1, incorporates all previous changes and additions of material thereto and supersedes NAVORD OP 2215, Volume 1, First Revision, dated 1 March 1967.

Subjects such as fire control systems, guns, and handling equipment which are not part of the -ition components are not included in this publication. Also not included are aranu- nition and associated components procured from the Army for use by Naval Units ashore.

The contents of this manual are official and incorporate technical data available up to the cutoff date of 15 January 1972.

Comments or inquiries relative to errors discovered, items omitted, or new items which should be added are invited and should be forwarded to: Commanding Officer, Naval Ordnance Station, Louisville, Kentucky 40214, Attention: Code 506.

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Foreword/Foreword-2 blank

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TABLE OF CONTENTS

- Chapter Page

LIST OF ILLUSTRATIONS . . . . . . . . . . . . vii

LIST OF TABLES . . . . . . . . . . . . . . . . . . . xi -_

SAFETY SUMMARY . . . . . . . . . . . . . . . . . . . xiv

- _- 1 INTRODUCTION

l-l l-2 l-4 l-5

_ A l-7 l-10

- l-11

1-12

-- 1-13 l-14 1-15 1-16

1-17

1-18 1-19

- l-20 1-21

l-23 l-24 l-25 l-26 l-27 l-28 1-29

-- 1-31

Scope and Purpose ....... l-l Coverage ................ l-l Intended Uses ........... l-l Arrangement of Material . . l-l How to Use the Manual ... l-l Classification of Gun Ammunition ............ l-l

Classification by Size of Gun ................ l-l

Classification by Assembly .............. l-l

Case Ammunition ......... l-l Fixed Ammunition ........ l-3 Sepcarated -ition .... l-3 Separate-Loading (Bagged Gun) Ammunition ....... l-3

Classification by Service Use ........... l-3

Service Ammunition ...... l-3 Target and Training Ammunition ............ l-3

Dummy Drill Ammunition . . l-3 Primary Components of Ammunition ............ l-3

Explosives .............. l-3 Projectile ........ ..t ... l-4 Fuze .................... l-4 Primer .................. 1-4 Tracer .................. 1-4 Propelling Charges ...... l-4 Miscellaneous Components. l-4 Gas Checks .............. l-4

Chapter

l-32 1-33 l-34 l-35 l-36 l-37 l-38 l-39

1-41 l-42 l-43

1-44

l-45 l-46

I l-47 1-51 l-53 l-54 1-57 l-58

Page

Tracer Washers ......... 1-4 Adapters ............... l-4 Plastic and Cork Plugs . l-4 wad .................... 1-4 Distance Piece ......... l-4 Lead Foil .............. l-6 Fuze Cavity Liner ...... l-6 Handling and Shipping Parts ................ l-6

Spacers ................ 1-6 Cartridge Extractors ... l-6 Waterproof Protecting Caps ................. l-6

Projectile and Cartridge Nose Supports ........ l-6

Grommets ............... l-6 Ammunition Data Cards . . l-6 Ammunition Containers . . l-6 Ammunition Boxes ....... l-7 Cartridge Tanks ........ l-7 Powder Tanks ........... 1-7 Fuze and Primer Cans ... 1-9 Other Publications for Reference ............ l-9

2 WITION ASSEMBLIES

2-l Organization of Data . . . 2-l 2-3 Further References . . . . . 2-1 2-5 Rocket Assisted Projec-

2-11 2-12 2-15 2-16 2-20 2-21 2-22

tile (RAP), 5"/38 Mk 57 Mods 0 and 1 . . . . . . 2-35

Description . . . . . . . . . . . . 2-35 Minimum Range . . . . . . . . . . 2-37 Safety and Training . . . . 2-37 WI Fuzes for 5"/38 RAP. 2-37 Igniter Mk 279 . . . . . . . . . 2-38 Storing and Handling . . . 2-39 Safety Precautions . . . . . 2-40 RAP, 5"/54 Mk 58 Mod 0.. 2-40 Description . . . . . . . . . . . . 2-40

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NAVORD OP 2215 VOW 1 SECOND REVISION

TABLE OF CONTENTS (Continued)

Chapter Page

2 AMMUNITION ASSEMBLIES (Cont'd.)

2-23 Minimum Range .......... 2-40 2-24 Safety and Training .... 2-40 2-25 CVT Fuze for 5"/54 RAP . 2-40 2-26 Igniter Mk 279 Mod 1 ... 2-41 2-27 Storing and Handling ... 2-41

3 FUZES

3-l Organization of Data ... 3-l 3-3 Further References ..... 3-l 3-5 Mechanical Time Fuzes

g:;

a(gF&. ............... ..............

3-z

Mk 50 MTF .............. 3-5 3-8 Mk 51MTF .............. 3-9 3-9 Mk 57 MTF .............. 3-13 3-10 Mk 61 MI?? .............. 3-15 3-11 Mk 62 MTF .............. 3-15 3-12 Mk 342 MTF ............. 3-18 3-13 Mk 349 MTF ............. 3-21 3-14 MS64 MTF ............... 3-27 3-15 M565El MTF ............. 3-33 3-16 Point Detonating Fuzes

(PDF) ................ 3-37, 3-17 Mk 26 PDF .............. 3-37 3-18 Mk 27 PDF .............. 3-37 3-19 Mk 29 PDF .............. 3-38 3-20 Mk 30 PDF .............. 3-42 3-21 Mk 66 PDF .............. 3-46 3-22 Mk 78 PDF .............. 3-49 3-23 Base Detonating Fuzes

(BDF) ................ 3-51 3-24 Mk 20 BDF .............. 3-51 3-25 Mk 21 BDF .............. 3-52 3-26 Mk 28 EDF .............. 3-55 3-27 Mk 31 BDF .............. 3-56 3-28 Mk 48 BDF .............. 3-58 3-29 Mk 64 BDF .............. 3-61 3-30 Mk 83 BDF .............. 3-65 3-31 M66 BDF ................ 3-67 3-32 Auxiliary Detonating

Fuzes (ADF) .......... 3-69 3-33 Mk 43 ADF .............. 3-69 3-34 Mk 44 ADF .............. 3-69 3-35 Mk 52 ADF .............. 3-71 3-36 Mk 54 ADF .............. 3-71 3-37 Mk 55 ADF .............. 3-73

Chapter

3-38 3-39 3-40 3-41

3-42 3-43 3-44 3-45 3-46 3-47 3-48 3-49 3-50 3-51 3-52

3-54 3-55 3-56 3-57 3-58 3-59 3-60

3-61

3-62 3-63

3-65 3-66 3-67 3-68

Page

Mk 89 ADF . . . . . . . . . . . . . . 3-73 Mk 379 and Mk 384 ADFs . 3-75 Mk 395 and Mk 396 ADFs . 3-81 Variable Time Radio Frequency (VT-RF) Fuzes . . . . . . . . . . . . . . . . 3-85

Description . . . . . . . . . . . . 3-85 Operation . . . . . . . . . . . . . . 3-85 Safety Features . . . . . . . . 3-85 Mk 71VT-RF Fuze . . . . . . . 3-86 Mk 72 VT-RF Fuze . . . . . . . 3-88

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Mk 73 VT-RF Fuze . . . . . . . 3-91 Mk 74 VT-RF Fuze . . . . . . . 3-93 Mk 75 VT-W Fuze . . . . . . . 3-95 Mk 76 VT-RF Fuze . . . . . . . 3-97

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Mk 79 VT-W Fuze . . . . . . . 3-99 Variable Time Infra- Red @'I'-IR) Fuzes . . . . 3-101

Description . . . . . . . . . . . . 3-101 Operation . . . . . . . . . . . . . . 3-101 Safety Features . . . . . . . . 3-101 Mk 90 VT-IR Fuze . . . . . . . 3-101 Mk 91 VT-IR Fuze . . . . . . . 3-105 Mk 92 VT-IR Fuze . . . . . . . 3-107 Controlled Variable Time (CVT) Fuzes . . . . . 3-108

M513A2 and M514Al CVT Fuzes . . . . . . . . . . . . . . . . 3-108- ._~

Mk 338 CVT Fuze . . . . . . . . 3-111 CVT Fuze and Adapter Assemblies (Mks 357, 358, 359, 360, 361, 362, 365, 366, 367, -369, 370, and 371) . . 3-113

Fuze Boosters . . . . . . . . . . 3-123 Mk 5 Mod 0 Booster . . . . . 3-123 Mk 30 Mod 0 Booster . . . . 3-123 Mk 39 Mod 0 Booster . . . . 3-123

4 PRIMERS

4-l Organization of Data _- . . .

4-l

4-3 Further References . . . . . 4-l 4-5 Case Electric Primers . . 4-2 4-6 Primer Mk 37 and Mods . . 4-2 4-7 Primer Mk 38 and Mods . . 4-4 4-8 Primer Mk 39 and Mods . . 4-6 4-9 Primer Mk 40 and Mods . . 4-8 4-10 Primer Mk 42 and Mods . . 4-10

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Chapter Page

i . 4 PRIMERS (Cont'd.)

4-11 Primer Mk 45 and Mods . . 4-14 - 4-12 Primer Mk 48 and Mods . . 4-16

4-13 Primer Mk 153 Mod 0 . . . . 4-20 4-14 Primer MS2 . . . . . . . . . . . . . 4-22 4-15 Case Percussion

Primers . . . . . . . . . . . . . . 4-24 4-16 Primer Mk 10 Mod 9 . . . . . 4-24 4-17 Primer Mk 21 and Mods . . 4-26 4-18 Primer Mk 22 and Mods . . 4-28 4-19 Primer Mk 30 Mod 0 . . . . . 4-30 4-20 Primer Mk 31Mod 0 . . . . . 4-32

- 4-21 Primer M36Al . . . . . . . . . . . 4-34 P-x 4-22 Primer Mk 41 Mod 0 . . . . . 4-36 4-23 Case Combination

Primers . . . . . . . . . . . . . . 4-38 -

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4-24 Primer Mk 20 and Mods . . 4-38 4-25 Primer Mk 35 and Mods . . 4-42 4-26 Case Combination

Ignition Primers . . . . . 4-44 4-27 Primer Mk 13 and Mods . . 4-44 4-28 Primer Mk 27 Mod 0 . . . . . 4-46 4-29 Lock Combination

Primers . . . . . . . . . . . . . . 4-48 4-30 Primer Mk 15 and Mods . . 4-48 4-31 Case Electric Test

Primers . . . . . . . . . . . . . . 4-50 4-32 Primer Mk 44 Mod 0 . . . . . 4-50

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5 TRACERS

5-l Organization of Data . . . 5-l 5-3 Further References . . . . . 5-l

6 CARTRIDGECASES

6-l Organization of Data . . . 6-l 6-3 Further References . . . . . 6-1

7 SPECIAL CHARGES

7-1 Organization of Data . . . 7-l 7-3 Further References . . . . . 7-l

8 AMWNITION CONTAINERS

- _ 8-l Organization of Data . . . 8-l 8-2 Further References . . . . . 8-l

Chapter Page

9

10

MISCELLANEOUS COMPONENTS AND DETAIL PARTS


OBSOLESCENT AND OBSOLETE PROJECTILE ASSEMBLIES


Notes . . . . . . . . . . . . . . . . . . lo-12

Appendix

A EXPLOSIVES

A-l A-3 A-7 A-9 A-10 A-11 A-12

A-13 A-15

A-16 A-18 A-19 A-20

Introduction ........... A-l Propellants ............ A-2 Smokeless Powder ....... A-2 Single-Base Powder - ..... Multibase Powder ....... f-Z Index of Powder ........ A-3 Class Designation Letters .............. A-3

Black Powder ........... A-4 Classes of Black Powders .............. A-4

High Explosives ........ A-4 Initiators ............. A-4 Boosters ............... A-5 Bursting Charges ....... A-5

B PROJECTILES

B-l Introduction ........... B-l B-3 Common Features ........ B-l B-4 Ogive .................. B-l B-5 Bourrelet .............. B-l B-6 BdY ................... B-l B-7 Rotating Band .......... B-2 B-8 Base ................... B-2 B-9 Classification ......... B-2 B-11 Antiaircraft ........... B-2 B-12 Antiaircraft Common .... B-2 B-13 Armor-Piercing ......... B-3 B-14 Armor-Piercing-Tracer . . B-3 B-15 Cornnon ................. B-5 B-16 Chemical ............... B-5

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Appendix

B PROJECTILES (Cont'd.)

Page

B-17 Dark Ignition .......... B-5 B-18 Drill .................. B-5 B-19 Durmny .................. B-6 B-20 High Capacity .......... B-6 B-21 High Explosive ......... B-6 B-22 High Explosive-

Incendiary ........... B-6 B-23 HE-MT and HE-PD ........ B-6 B-24 High Explosive-Tracer . . B-9 B-25 High Explosive-

Incendiary-Tracer .... B-9 B-26 Illuminating ........... B-9 B-27 Rocket Assisted

Projectile ........... B-9 B-28 Self-Destroying, Non-

Self-Destroying ...... B-9 B-29 Target ................. B-10 B-30 Fuze Cavity Liner-VT ... B-11 B-31 Nonfragmenting ......... B-11 B-32 Window (Chaff-Loaded) . . B-11

C FUZES

C-l Introduction ........... C-l c-3 Identification and

Marking .............. C-l c-4 General Fuze Arming

and Function - ......... C-6 Setback ................ :-: c-7 Angular Setback ........ C-l C-8 Creep - .................. c-9 Centrifugal Force ...... E-g C-10 Friction ............... C-3 C-11 Impact ................. c-3 C-12 Explosive Components

in Fuzes ............. C-3 C-14 Primer ................. C-3 C-15 Detonator .............. C-3 C-16 Delay .................. c-4 C-17 Relay .................. c-4 C-18 Lead ................... C-4 C-19 Booster ................ c-4 C-20 Mechanical Time Fuzes

(MI-F) ................ c-4 C-21 Description ............ C-4 C-22 Components ............. c-4 C-23 Operation .............. c-7

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Appendix Page

C-24

C-25 C-26

C-27 C-28 c-30

c-31 C-32 c-33 c-35

C-36 c-37 C-38

c-39 c-40 C-42

c-43 c-44 c-45 c-47

C-48 c-49 c-50

c-51 C-52 c-54

c-55 C-56 c-57 c-59

C-60 C-61 C-62 C-64

C-65 C-66 C-67

Explosive Component (Magazine) ........... C-8

Safety Features ........ C-8 Point Detonating Fuzes (PDF) .......... C-8

General Description .... C-8 Type I PDF ............. C-8 Description of Type I PDF .................. C-9

Operation .............. C-9 Safety Features ........ C-10 Type II PDF ............ C-10 Description of Type II PDF .................. c-10

Operation .............. C-10 Safety Features ........ C-12 Auxiliary Detonating Fuzes (ADF) .......... c-12

General Description .... C-12 ?)rpe I ADF ............. C-13 Description of Type I

. OpgEtion

............................... c-13

Safety Features E-i: - ........

Type II ADF ............ c-13 Description of Type II

Op%%ion ................................ c-14

Safety Features ........ E-i: -

Base Detonating Fuzes (BDF) ................ c-16

General Description .... C-16 Type I BDF ............. C-16 Description of Type I BDF .................. C-16

Operation .............. C-16 Safety Features ........ C-18 Type II BDF ............ C-18 Description of Type II BDF .................. C-18

Operation .............. C-18 Safety Features ........ C-18 Proximity (VT) Fuzes ... C-18 Variable Time Radio Frequency (VT-RF) Fuzes ................ c-19

Description ............ c-19 Fuze Body .............. c-19 Oscillator ............. C-21

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NAVORD OP 2215 VOLUME 1 SECOND REVISION r=


Appendix

C FUZES (Cont'd.)

Page

C-68 C-69 c-70

c-71

C-72 c-73

c-74 c-75 C-76 c-77 C-78 c-79

C-80 C-81 C-82 C-83 C-84 C-85 -

C-86 C-87

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C-88 C-89 c-90 c-91 c-92 c-93 c-94 c-95

C-96

c-97 C-98 c-99

Amplifier .............. c-21 Reserve Energizer ...... C-21 Rear Fitting Safety Device ............... C-22

ADFs Used in Early Fuzes ................ C-25

Booster ................ C-25 Assembly and Waterproofing ........ C-25

~;;;E$on .............. ................

E-g -

Fuze Arming ............ C-26 Armed Flight ........... C-27 Self-Destruction ....... C-28 Variable Time Infra-Red

(VT-IR) Fuzes ........ Description ............

E-ii .

Fuze Body .............. C-28 Fuze Monitor ........... C-28 Firing Control ......... C-28 Reserve Energizer ...... c-29 Rear Fitting Safety Device ............... C-29

Fuze Booster ........... C-29 Assembly and Waterproofing ........

Operation .............. E-t: .

CVT Fuzes .............. C-30 Description ............ C-30 Impact Device .......... c-30 Oscillator-Amplifier ... C-30 Reserve Energizer ...... C-30 Switch Ring Assembly ... C-30 Rear Fitting Safety Device ............... c-30

Auxiliary Detonating Fuze ................. c-30

Waterproofing .......... Operation . ..............

E-z:

Effectiveness .......... c-33 C-100 Operability . . . . . . . . . . . . C-33

D PRIMERSAND TRACERS

D-l Introduction ........... D-l D-3 Primers ................ D-l D-4 Definition ............. D-l

Appendix Page

D-5 D-6 D-7 D-8 D-9 D-10 D-11

D-12 D-13

D-14

D-15 D-16 D-17 D-18 D-19 D-20 D-21 D-22 D-23 D-24

Classification ......... D-l Percussion Primers ..... D-l Electric Primers ....... D-l Ignition Primers ....... D-2 Percussion Caps ........ D-2 Case Percussion Primers. D-3 Case Percussion Igni- tion Primers ......... D-3

Case Electric Primers . . D-5 Case Combination Igni- tion Primers ......... D-5

Lock Combination Primers .............. D-6

Electric Test Primers . . D-7 Drill Primers .......... D-7 Tracers ................ D-7 Definition ............. D-7 Classifications ........ D-7 Operation .............. D-8 Composition ............ D-8 Use .................... D-8 Colors ................. D-9 Tracer Washers ......... D-9

E PROPELLING DEVICES AND SALUTING CHARGES

E-l E-3 E-4 E-5

E-6

E-7 E-8 E-9 E-10 E-11 E-12 E-13

Introduction ........... E-l Case Ammunition ........ E-l Description ............ E-l Differences in Fixed and Separated Rounds . E-l

Cartridge Case Components ........... E-l

Reduced Charge ......... E-4 Bagged Charges ......... E-5 Description ............ E-5 Material ............... E-6 Ignition End ........... E-6 Loading ................ E-6 Classification of Bagged Charges ....... E-6

Lead Foil .............. E-7 Special Charges ........ E-7 Saluting Charges ....... E-7 Torpedo Impulse Charge . E-7 Depth Charge Projector Impulse Charges ...... E-9

Short Charges .......... E-9

E-14 E-15 E-16 E-17 E-18

E-19

V



Appendix Page Appendix Page

F GAS CHECK SEAL INSPECTION CRITERIA FOR PROJECTILES ASSEMBLED WITH BASE FUZES/ BASE FUZE HOLE PLUGS

F-l Background - . . . . . . . . . . . . . F-4 Criteria to be Used . . . . g-t F-6 Mandatory GCS

Requirements . . . . . . . . . F-3 F-7 Additional Acceptable

GCS Conditions . . . . . . . F-3 F-8 Unacceptable GCS

Conditions . . . . . . . . . . . F-3 F-9 Fleet Inspection of

Projectile Gas Check Seals Subsequent to Issue . . . . . . . . . . . . . . . . F-8

G GAS NOSE FUZEIIEMCWAL/REPLACEMENT ABOARD SHIP

G-l Procedures for 5"/38, 6"/47 Single-Purpose, and 8" Projectiles with Nose Fuze Adapters - . . . . . . . . . . . . .

G-3 Nose Fuze Removal . . . . . . :-: G-4 Nose Fuze Replacement . . G-l G-5 Procedures for 5"/54

and 6"/47 Dual-Purpose Projectiles with Nose Fuze Adapters . . . . . . . . G-3

G-7 Nose Fuze Removal . . . . . . G-3 G-8 Nose Fuze

Replacement . . . . . . . . . . G-3

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vi


LIST OF ILLUSTRATIONS

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Figure Page

l-l l-2

l-3

l-4 -1 ~--

2-l

2-2

--. - 2-3 2-4 3-l

- 3-2

3-3 --~ 3-4

3-5 3-6 3-7 3-8

3-9 3-10 3-11 3-12 3-13

3-14

3-15

3-16 -

3-17

Types of Gun Ammunition . . . l-2 Miscellaneous Gun Ammunition Components and Details . . . . . . . . . . . . . l-5

Typical Box-Type Containers . . . . . . . . . . . . . . l-7

Typical Tank-Type Containers . . . . . . . . . . . . . . 1-8

Mk 57 Mod 1 RAP (Rocket Assisted Projectile), Cutaway View . . . . . . . . . . . . 2-35

Mk57ModlRAP, External View . . . . . . . . . . . 2-37

Mk 279 Mod 1 Igniter . . . . . . 2-39 Mk 58 Mod 0 RAP . . . . . . . . . . . 2-41 Mk 25 Mod 5MTF

(Mechanical Time Fuze) . . 3-2 Mk 25 Mod 5 MTF, Slider- Type Escapement Release . 3-2

Mk 50 Mod 8 MTF . . . . . . . . . . . 3-4 Mk 50 Mod 8 MTF Details . . . 3-6 Mk 51 Mod 2 MlYF . . . . . . . . . . . 3-8 Mk 51 Mod 2 MTF Details . . . 3-10 Mk 57 Mod 2 MTF . . . . . . . . . . . 3-12 Mk 57 Mod 2 MTF Centrifugal Gear Assembly . . . . . . . . . . . 3-12

Mk 61 Mod 1 MTF . . . . . . . . . . . 3-14 Mk 62 Mod 1 MTF . . . . . . . . . . . 3-14 Mk 62 Mod 1 MTF Details . . . 3-16 Mk 342 Mod 0 MI'F . . . . . . . . . . 3-18 Mk 349 Mod 0 MTF, External View . . . . . . . . . . . 3-20

Mk 349 bIod 0 MTF, Cutaway View . . . . . . . . . . . . 3-22

Mk 349 bbd 0 MTF Timing Mechanism Schematic . . . . . 3-24

MS64 MTSQ (Mechanical Time Superquick) Fuze . . . 3-26

MS64 MTSQ Fuze, Exploded View . . . . . . . . . . . 3-28

Figure Page

3-18 MS64 MEQ Fuze, Time Scale .............. 3-30

3-19 MS65 MTSQ Fuze ............ 3-32 3-20 Mk 26 Mod 1 PDF (Point

Detonating Fuze) ........ 3-35 3-21 Mk 26 Mod 1 PDF,

Sectional View .......... 3-35 3-22 Mk 27 Mod 0 PDF ........... 3-36 3-23 Mk 29 Mod 3 PDF ........... 3-38 3-24 Mk 29 Mod 5 PDF ........... 3-40 3-25 Mk 29 PDF, Old and New

Production .............. 3-41 3-26 Mk 30 Mod 3 PDF ........... 3-42 3-27 Mk 30 Mod 5 PDF ........... 3-44 3-28 Mk 30 PDF, Old and New

Production .............. 3-45 3-29 Mk 66 PDF ................. 3-46 3-30 Mk 79 Mod 0 PDF ........... 3-48 3-31 Mk 20 Mod 5 BDF (Base

Detonating Fuze) ........ 3-50 3-32 Mk 21Mod 3 BDF ........... 3-52 3-33 Mk 28 Mod 17 BDF .......... 3-54 3-34 Mk 31 Mod 2 BDF ........... 3-56 3-35 Mk 48 Mod 3 BDF ........... 3-58 3-36 Mk 64 Mod 2 BDF ........... 3-60 3-37 Mk 64 Mod 3 BDF ........... 3-62 3-38 Mk 83 Mod 0 BDF ........... 3-64 3-39 M66A2 BDF ................. 3-66 3-40 Mk 43 Mod 1 ADF (Auxiliary

Detonating Fuze) ........ 3-68 3-41 Mk 44 Mod 1 ADF ........... 3-68 3-42 Mk 52 Mod 0 ADF ........... 3-70 3-43 Mk 54 Mod 0 ADF ........... 3-70 3-44 Mk 55 Mod 0 ADF ........... 3-72 3-45 Mk 89 Mod 0 ADF ........... 3-72 3-46 Mk 379 Mod 0 ADF,

Typical Applications .... 3-74 3-47 Mk 379 Mod 0 ADF .......... 3-76 3-48 Mk 379 Mod 0 ADF Arming

Delay Mechanism ......... 3-77

vii


LIST OF ILLUSTRATIONS (Continued)

Figur re Page Figure Page

3-49

3-50 3-51

3-52 3-53

3-54 3-55 3-56 3-57 3-58 3-59 3-60 3-61 3-62 3-63 3-64 3-65 3-66

3-67

3-68

3-69

3-70

3-71

3-72

3-73

3-74

3-75

3-76

3-77

3-78

viii

Mk 384 Mod 0 ADF, Typical Application . . . . . 3-78

Mk 384 Mod 0 ADF . . . . . . . . . . 3-79 Mk 395 Mod 0 ADF, Typical Applications . . . . 3-80

Mk 395 Mod 0 ADF . . . . . . . . . . 3-82 Mk 396 Mod 0 AUF, Typical Applications . . . . 3-83

Mk 396 Mod 0 ADF . . . . . . . . . . 3-84 Mk 71 VT (Proximity) Fuze . 3-86 Mk 72 VT Fuze . . . . . . . . . . . . . 3-88 Mk 73 VT Fuze . . . . . . . . . . . . . 3-90 Mk 74 VT Fuze . . . . . . . . . . . . . 3-92 Mk 75 VT Fuze . . . . . . . . . . . . . 3-94 Mk 76 VT Fuze . . . . . . . . . . . . . 3-96 Mk 79 VT Fuze . . . . . . . . . . . . . 3-98 Mk 90 Mod 0 VT-IR Fuze . . . . 3-100 Mk 90 Mod 1 VT-IR Fuze . . . . 3-102 Mk 91 VT-IR Fuze . . . . . . . . . . 3-104 Mk 92 VT-IR Fuze . . . . . . . . . . 3-106 Mk 338 Mod 0 CVT

(Controlled Variable Time) Fuze . . . . . . . . . . . . . . 3-110

Mk 357 Mod 0 CVT Fuze and Adapter Assembly . . . . 3-112

Mk 358 Mod 0 CVT F'uze and Adapter Assembly . . . . 3-112

Mk 359 Mod'0 CVT Fuze and Adapter Assembly . . . . 3-114


Mk 361Mod 0 CVT Fuze and Adapter Assembly . . . . 3-116




Mk 367 Mod 0 CVT Fuze and Mapter Assembly . . . . 3-118



Mk 371Mod 0 CVT Fuze and Adapter Assembly . . . . 3-118

3-79

3-80

3-81

3-82 3-83 3-84 4-l

4-2

4-3

4-4

4-5

4-6

4-7

4-8

4-9

4-10

4-11

4-12

4-13

4-14

4-15

4-16

4-17

Typical Fuze and Adapter Assembly, Exploded View . 3-120

Typical Fuze and Adapter Assembly Installed in 5"/54 Projectile . . . . . . . . 3-121

Typical Fuze and Adapter Assemblies Installed in 5"/38, 6"/47, and 8"/55 VT Projectiles and in 5"/38 RAP . . . . . . . . . . . . . . . 3-121

Mk 5 Mod 0 Booster . . . . . . . . 3-122 Mk 30 Mod 0 Booster . . . . . . . 3-122 Mk 39 Mod 0 Booster . . . . . . . 3-122 Mk 37 Electric Screw Primer . . . . . . . . . . . . . . . . . . 4-2

Mk 38 Electric Screw Primer . . . . . . . . . . . . . . . . . . 4-4



Mk 42 Mod 0 Electric Screw Primer . . . . . . . . . . . . 4-10

Mk 42Mods land 2 Electric Screw Primer . . . 4-12




Mk 153 Case Electric Primer . . . . . . . . . . . . . . . . . . 4-20

M52A3B2 Case Electric Primer . . . . . . . . . . . . . . . . . . 4-22

Mk 10 Case Percussion Primer . . . . . . . . . . . . . . . . . . 4-24

Mk 21 Percussion Screw Type Primer . . . . . ...*.... 4-26

Mk 22 Case Percussion (Push Fit) Primer . . . . . . . 4-28

Mk 30 Case Percussion Primer . . . . . . . . . . . . . . . . . . 4-30

Mk 31 Case Percussion (Push Fit) Primer . . . . . . . 4-32

M36Al Case Percussion Primer . . . . . . . . . . . . . . . . . . 4-34

- -

-- -

---

~--



Figure Page Figure Page

4-18 /I

4-19

-.

4-20

4-21

4-22

- -- 4-23

4-24

4-25 --

B-l - B-2

B-3

-? B-4

B-5 B-6

B-7 B-8

B-9 -_

B-10

B-11 B-12

B-13 B-14

Mk 41 Percussion Screw Primer . . . . . . . . . . . . . . . . . . 4-36

Mk 20 Mod 0 Percussion Electric Screw (Case Combination) Primer . . . . . 4-38

Mk 20 Mods land 2 Percussion Electric Screw (Case Combination) Primer . . . . . . . . . . . . . . . . . . 4-40

Mk 35 Percussion Electric Screw (Case Combination) Primer . . . . . . . . . . . . . . . . . . 4-42

Mk 13 Percussion Electric Screw (Case Combination Ignition) Primer . . . . . . . . 4-44

Mk 27 Percussion Electric Screw (Case Combination Ignition) Primer . . . . . . . . 4-46

Mk 15 Percussion Electric Lock Primer . . . . . . . . . . . . . 4-48

Mk 44 Electric Screw (Case Electric Test) Primer . . . . . . . . . . . . . . . . . . 4-50

Typical Projectile . . . . . . . . B-l Typical Antiaircraft Projectile . . . . . . . . . . . . . . B-2

Typical Antiaircraft Common Projectile . . . . . . . B-3

Variations of Armor- Piercing Projectiles . . . . B-4

Typical Common Projectile . B-4 Typical Chemical Projectile (White Phosphorus Load) . . . . . . . . B-5

Typical Drill Projectile . . B-5 Typical High Capacity Projectile . . . . . . . . . . . . . . B-6

20mmAAHE-Type Projectiles . . . . . . . . . . . . . B-7

40mm HE-Type Projectiles . . . . . . . . . . . . . B-7

20mm AC Projectiles . . . . . . . B-8 Typical Illuminating Projectile . . . . . . . . . . . . . . B-9

Typical Target Projectile . B-10 Typical FCL-VT Projectile . . . . . . . . . . . . . . B-11

B-15

B-16 C-l c-2 c-3

c-4 c-5 C-6 c-7 C-8 c-9 c-10 c-11 c-12

c-13 c-14

c-15 C-16 c-17

D-l

D-2

D-3

D-4

D-5

D-6

D-7

D-8

D-9 D-10 D-11

E-l

Typical Nonfragmenting Projectile .............. B-12

Typical Window Projectile . B-12 Farces That Work on Fuzes . C-2 Typical MTF ............... C-5 Typical MTF Timing Mechanism ............... C-6

Type I PDF ................ C-9 Type II PDF ............... c-11 Type I ADF ................ C-14 Type II ADF ............... C-15 Type I BDF ................ C-17 Type II BDF ............... C-19 Type VT-RF Fuze ........... C-20 Mk 3 Mod 1 Spin Breaker ... C-23 Mk 18 Mod 2 Rear Fitting Safety Device ........... C-24

Reed Spin Switch .......... C-25 Operational Sequence of VT-RF Fuze Components when Fired from a Gun ... C-27

Typical CVT Fuze .......... C-31 CVT Fuze Time Scale ....... C-32 Arming Sequence for CVT Fuzes ............... C-34

Percussion Cap Type Primer .................. D-2

Electric Cap Type Primer .................. D-2

Typical Case Percussion Primer .................. D-2

Typical Case Percussion Ignition Primer ......... D-3

Typical Case Electric Primer .................. D-4

Typical Case Combination Ignition Primer ......... D-5

Typical Lock Codination Primer .................. D-6

Typical Electric Test Primer .................. D-7

Typical Internal Tracer ... D-7 Typical External Tracer ... D-8 Tracer for 20mm AC fbnmunition .............. D-9

Typical Round of Fixed Ammunition .............. E-2

ix



Figure Page Figure Page

E-2

E-3

E-4

E-5 E-6

E-7

E-8

E-9

Typical Round of 20mm AC Ammunition . . . . . . . . . . . E-2

Typical Cartridge Case for Separated Ammunition . . . . E-3

Typical Polyurethane Plug . . . . . . . . . . . . . . . . . . . . E-4

Bagged Charges . . . . . . . . . . . . E-5 Ignition End of Bagged Charge . . . . . . . . . . . . . . . . . . E-6

m&;iezaluting . . . . . . . . . . . . . . . . . E-7

Typical Torpedo Impulse Charge . . . . . . . . . . . . . . . . . . E-8

Typical Depth Charge Projector Impulse Charge ..,.....,......... E-9

F-l

F-2 F-3 F-4 F-5 F-6 F-7 F-8

F-9

F-10 G-l

Mandatory GCS (Gas Check Seal) Requirements . . . . . . F-2

Slight Gap Around GCS . . . . . F-2 i%ltiple Press of GCS . . . . . F-4 Canted GCS . . . . . . . . . . . . . . . . F-4 Entire GCS Missing . . . . . . . . F-5 Inverted GCS . . . . . . . . . . . . . . F-S Missing Lead Core . . . . . . . . . F-6 GCS Not Fully or Properly Seated . . . . . . . . . F-6

GCS Seated Above Either or Both Projectile Base and Base Fuze/Plug . . . . . . F-7

Torn, Cut, or Gouged GCS . . F-7 Use of Vise Grip Nose Fuze Adapter . . . . . . . . . . . . G-2

X


.--..

LIST OF TABLES

Table

2-l

2-2

- mR--. 2-3

2-4

2-5 -- --4

2-6

2-7

2-8 -

2-9

2-10

2-11

2-12

2-13

2-14

2-15

2-16

2Onrm AA Ammunition for Guns Mk 4, Projectile Assembly . ..*............ 2-2

Propelling Charge Assembly for 2Or1nn AA Ammunition . . 2-3

20mm M Dummy Ammunition, Projectile Assembly . . . . . 2-3

2Omm AC Ammunition for Guns Ml 11 and Mk 12, Projectile Assembly . . . . . 2-4

Propelling Charge Assembly for 2Omm AC Anmnmition . . 2-5

20mm AC lkmmy Ammunition, Projectile Assembly . . . . . 2-5

40mm AA Ammunition for Guns Mk 1, Projectile Assembly . . . . . . . . . . . . . . . . 2-6

Propelling Charge Assembly for 401mn AA Ammunition . . 2-7

40mm Dummy Ammunition, Projectile Assembly . . . . . 2-7

3"/50 Ammunition for Guns Mk 21 and Mk 22, Projec- tile Assembly . . . . . . . . . . . 2-8

Propelling Charge Assembly for 3"/50 Annmmition . . . . 2-10

3"/50 Dummy Ammunition, Projectile Assembly . . . . . 2-11

5"/38 Ammunition for Guns Mk 12, Projectile Assembly . . . . . . . . . . . . . . . . 2-12

Propelling Charge Assembly for !?/38 Ammunition . . . . 2-19

St'/38 Dummy Ammunition, Projectile Assembly . . . . . 2-19

5"/54 Ammunition for Guns Mk 16 and Mk 18, Projec- tile Assembly . . . . . . . . . . . 2-20

Propelling Charge Assembly for St/54 Ammunition . . . . 2-22

2-17 --

Page Table

2-18

2-19

2-20

2-21

2-22

2-23

2-24

2-25

2-26

2-27

2-28

2-29

2-30

2-31

Page

5"/54 Dummy Ammunition, Projectile Assembly . . . . . 2-22

6"/47 Ammunition for Guns Mk 16 (SP), Projectile Assembly . . . . . . . . . . . . . . . . 2-23

Propelling Charge Assembly for 6"/47 Ammunition (Single Purpose Guns) . . . 2-24

6"/47 Ammunition for Guns Mk 16 (DP), Projectile Assembly . . . . . ..e........ 2-25

Propelling Charge Assembly for 6"/47 Ammunition (Dual Purpose Guns) . . . . . 2-26

6"/47 Iknnmy Ammunition for Guns Mk 12, Mk 14, Mk 15, and Mk 16 . . . . . . . . . . . . . . . 2-26

8"/55 Ammunition for Guns Mk 12, Mk 14, and Mk 15, Projectile Assembly . . . . . 2-27

Propelling Charge Assembly for Sl'/SS Ammunition (Bagged Guns) . . . . . . . . . . . 2-28

8"/55 Dummy Ammunition for Guns Mk 12, Mk 14, and Mk 15, Projectile Assembly . 2-28


Propelling Charge Assembly for 8"/55 Ammunition (Case Guns) . . . . . . . . . . . . . 2-30

Sfr/55 Dummy Armmrnition for Guns Mk 16, Projectile Assembly . . . . . . . . . . . . . . . . 2-30

16"/45 Ammunition for Guns Mk 6 and Mk 8, Projectile Assembly . . . . . 2-31

Propelling Charge Assembly for 16"/45 Ammunition . . . 2-32

xi

NAVORD OP 2215 VOLUME 1 SECOND REVISION --

LIST OF TABLES (Continued)

Table Page Table Page

2-32

2-33

2-34

2-35

2-36

3-l 3-2 3-3 3-4

3-5

3-6

3-7

3-8

3-9

4-l 4-2 4-3 4-4

4-5 4-6

5-l

6-l

7-l 7-2 7-3

8-1 8-2 8-3

xii

16"/45 Dummy Ammunition for Guns Mk 6 andMk 8, Projectile Assembly . . . . . 2-32


Propelling Charge Assembly for 16"/50 Anmnmition . . . 2-34

16"/50 IXmuny Ammunition for Guns Mk 7, Projec- tile Assembly . . . . . . . . . . . 2-34

Rocket Assisted Projectile (RAP) . . . . . . . . 2-36

Mechanical Time Fuzes ,.... 3-3 Point Detonating Fuzes . . . . 3-37 Base Detonating Fuzes . . . . . 3-51 Auxiliary Detonating Fuzes . . . . . . . . . . . . . . . . . . . 3-69

Proximity (Variable Time Radio Frequency) Fuzes . . 3-87

Proximity (Variable Time Infra-Red) Fuzes . . . . . . . . 3-103

Controlled Variable Time (CVT) Fuzes . . . . . . . . . . . . . 3-111

CV'T Fuze and Adapter Assemblies . . . . . . . . . . . . . . 3-115

Fuze Boosters . . . . . . . . . . . . . 3-123

Case Electric Primers . . . . . 4-3 Case Percussion Primers . . . 4-2.5 Case Combination Primers . . 4-39 Case Combination Ignition Primers . . . . . . . . . . . . . . . . . 4-45

Lock Combination Primers . . 4-49 Case Electric Test Primers . . . . . . . . . . . . . . . . . 4-51

Tracers . . . . . . . . . . . . . . . . . . . 5-2

Cartridge Cases . . . . . . . . . . . 6-2

Short Charges . . . . . . . . . . . . . 7-2 Saluting Charges . . . . . . . . . . 7-3 Impulse Charges . ..*...*..* 7-4

Ammunition Boxes . . . . . . . . . . 8-2 Cartridge Tanks . . . . . . . . . . . 8-4 Powder Tanks . . . . . . . . . . . . . . 8-6

9-1 9-2 9-3 9-4 9-5 9-6

9-7 9-8

9-9 9-10

9-11 9-12 9-13 9-14 9-15 9-16 9-17 9-18

9-19 9-20

9-21

10-l

10-2

10-3

10-4

10-5

10-6

10-7

Projectile Adapters . . . . . . . 9-2 Tracer Adapters . . . . . . . . . . . 9-3 Smoke Canisters . . . . . . . . . . . 9-3 Waterproof Protecting Caps. 9-3 Color Burst Units . . . . . . . . . 9-4 Distance Pieces for Full and Reduced Charges . . . . . 9-4 Fuze Gas Checks . . . . . . . . . . 9-5 Projectile Base Plug Gas Checks . . . . . . . . . . . . . 9-5

Base Plug Gaskets . . . . . . . . 9-6 Rotating Band Protecting Grommets . . . . . . . . . . . . . . . 9-7

Fuze Cavity Liners . . . . . . . 9-7 Chaff (Window) Loads . . . . . 9-8 Illuminating Loads . . . . . . . 9-8 Base Fuze Hole Plugs . . . . . 9-9 Dummy Nose Plugs . . . . . . . . . 9-9 Nose Shipping Plugs . . . . . . 9-10 Propelling Charge Plugs . . 9-10 Plugs for Short or Saluting Charges . . . . . . . 9-12

Tracer Hole Plugs . . . . . . . . 9-12 Wads for Propelling Charge . . . . . . . . . . . . . . . . . 9-13

Wads for Short and Saluting Charges . . . . . . . 9-13

3"/70 Obsolescent Assem- blies for Guns Mk 26 . . . 10-2

Propelling Charges and Shipping Components for Obsolescent 3"/70 Ammunition . . . . . . . . . . . . . 10-2

5"/25 Obsolescent Assemblies for Guns Mk 17 . . . ..I............ 10-3

Propelling Charges and Shipping Components for Obsolescent 5"/25 Ammunition "............ 10-5

5"/25 Obsolescent Dummy Ammunition . . . . . . . 10-S

12"/50 Obsolete Assemblies for Guns Mk 8 . . . . . . . . . . 10-6

Propelling Charges and Shipping Components for 12"/50 Obsolete Assemblies ,............ 10-7

LIST OF TABLES (Continued)


Table Page Table Page

10-8 12"/50 Obsolete Dtmmy Ammuntion . . . . . . . . . . . . . . 10-7

10-9 14"/45 Obsolete Assembly for Guns Mk 12 . . . . . . . . . 10-8

lo-10 Propelling Charges and Shipping Components for 14"/45 Obsolete Assemblies . . . . . . . . . . . . . 10-9

lo-11 14"500 Obsolete Assembly for Guns Mk 11 . . . . . . . . . lo-10

lo-12 Propelling Charges and Shipping Components for 14"/50 Obsolete Assemblies . . . . . . . . . . . . . lo-11

lo-13 14" Obsolete Dmny Ammunition . . . . . . . . . . . . . lo-11

C-l CVT Fuze Functions for Various Settings . . . . . . . C-32

-

-

xiii


s.fmTY SWY

--

The following information pertains to safety but does not appear elsewhere in this publication.

REPORTS OF ACCIDENTS, INCIDENTS, AND UNSATISFACTORY PERFORMANCE OF AMMUNITION

Occurrences of accidents, incidents, and unsatisfactory performance of all non-nuclear explosive ordnance and material shall be reported in accordance with NAVORDINST 8025.lA.

UNSERVICEABLE, SUSPENDED, AND LIMITED-USE WITION

For information pertaining to the degree of serviceability of ammunition and ammunition components used by the Navy, Marine Corps, and Coast Guard, refer to NAVORD OD 17190. It contains a listing of items, usually by lot number, which are not suitable for unrestricted use in the manner for which they were designed.

In cases where it has been determined that an ammunition item may endanger life or property, rapid promulgation of the information is accomplished by a message NAR (Notice of Ammunition Reclassification). OD 17190 as changes to that publication are made.)

(NARs are incorporated in

any change in the status of ammunition, Immediately upon receipt of

all commands shall determine whether stocks on hand include any of the affected lots or types. Action shall be taken to insure that the use or issue of the affected ammunition is consistent with the newly assigned classification.

The following information appears in Appendix F of this publication and is repeated here for emphasis.

FLEET INSPECTION OF PROJECTILE GAS CHECK SEALS SUBSEQUENI' TO IS,SUE

Fleet users shall check for damage to GCS (gas check seals) which may have occurred during handling, transportation, and storage subsequent to issue by an ammunition activity. Assure that:

1. GCS is not missing. 2. GCS is free of cuts, tears, or gouges which expose the lead core. 3. GCS is flush with or below base fuze or plug surface.

Ammunition with any of the above defects should be marked as defective and should be turned in at the soonest opportunity. A message report should be made to COMNAVORD, with copies to the Naval Weapons Station (QEL), Concord, California,

xiv

- .n.


SAFETY SUMARY (Continued)

-- === \

--

and the Naval Ammunition Production Engineering Center (NAPEC), Crane, Indiana, giving ammunition lot identification, nature of defect, and any background information on the cause, if available.

Inasmuch as certain Fleet units handle palletized ammunition, they are not expected to de-palletize and inspect GCS in accordance with the above instructions. The use of NAPEC GCS Display Kits for shipboard inspection of munition is not appropriate. Shipboard removal of paint from projectiles is not authorized. (Page F-8)

For criteria to be used when installing GCS or for pre-1970 (uninspected, unsuffixed) loaded ammunition, refer to Appendix F of this publication.

The following MARNINGS and WITIONS are repeated from the text of this publication for the protection of personnel.

WARNINGS

VT Non-Frag projectiles are for target and training purposes and have a combination black powder and pyrotechnic color burst element. Reduced charges may be used. (Page l-3)

Before firing CVT-fuzed projectiles over friendly forces, check the time setting on these fuzes. The estimated time-to-target must be accurately determined and the fuzes set to this time to prevent possible VT airbursts from occurring above the deployed friendly forces. (Pages 2-38, 2-40, 3-1.08, 3-113, and C-33)

Settings for PD functioning only on the PD mark of CVT fuze and adapter assemblies are not recommended. An inaccurate PD setting will not guarantee that the proximity circuits will remain inactive (unarmed) after the round is fired. For PD functioning only, set the fuze to 95 seconds to achieve positive PD action. At this setting of 95 seconds, the proximity circuits will not become armed for at least 92 seconds and the round will be safe for firing over friendly troops for this time. (Pages 2-38, 2-41, 3-109, 3-113, and C-33)

During handling of RAP, a drop in excess of 24 inches on the base of. the projectile in which a deck pin, (rivethead) bolt, or miscellaneous object strikes the center hole of the igniter, sufficient striking energy could be provided to actuate the igniter. In this event, ignition of the rocket motor may be delayed 20 to 30 seconds. All personnel should immediately evacuate the area. Do not attempt disposal prior to rocket motor ignition. If rocket motor burns in a closed compartment, insure that the area is clear of fumes prior to re-entry. Dispose of the projectile in accordance with standard EoD procedure. (Page 2-39)

xv


SAFETY SUMMARY (Continued)

WRNINGS

MTF Mk 61Mcd 0 is used at full and reduced charge in 5"/38 ILLUM and WP projectiles. It should not be used at full or reduced charge in 5"/38 HE projectiles. MTF Mk 61 Mod 1 is used at full or reduced charge in 5"/38 HE, WP, or ILLUM projectiles. (Page 3-17)

The Mk 27 PDF is not bore safe. (Page 3-37)

The Mk 29 Mods 2 and 3 PDFs should not be fired in heavy rain except in combat emergency conditions. will occur.

Early bursts The Mk 29 Mod 5 PDF should be used.

3-39 and C-12) (Pages

The Mk 30 Mods 2 and 3 PD fuzes should not be fired in heavy rain except in combat emergency conditions. Early bursts will occur. The Mk 30 Mod 5 PDF should be used. (Pages 3-43 and C-12)

The Mk 66 Mod 0 PD fuze should not be fired in heavy rain except in combat emergency conditions. Early bursts will occur. Mk 66 Mod 1 PDF should be used. C-12)

(Pages 3-47 and

5"/54 charges assembled with combination Primer Mk 13 are slow-fire charges only. These charges, NALC D309 and D310, shall not be used in rapid fire guns because the Mk 13 Primer can be initiated by the shock of ramming forces. (Pages 7-2 and E-4)

In a worn gun, bore enlargement at the origin will prevent the projectile from being fully seated when rammed. This will result in'rapid run-up and may damage the ogive of the nose fuze. This condition may cause early detonation of the projectile. (Page C-3)

A projectile found without a tracer and the tracer hole open (not plugged) is almost certain to result in early projectile burst when fired in a gun. (Page C-16)

The charge designation number is used to select a charge for a specific range for a particular depth charge. These impulse charges must be used only as specified to prevent injury to personnel or equipment. (Page E-9)

xvi


SAFETY SUMMARY (Continued)

- a+-\

.-

-

CAUTIONS

Extreme caution must be used in firing operations for RAP. Insure the correct identification of RAP projectiles in view of the similarity of projectile appearance and the dissimilarity of impact points of RAP compared to standard projectiles. (Page 2-37)

CVT fuzes must be set to 35 seconds or more when used in S-inch RAP. If fired at settings less than 35 seconds, the fuzes may function early as a result of rocket motor effects on the fuze. (P g a es 2-38, 2-40, 3-108, and 3-113)

When setting the Mechanical Time and Superquick Fuze M564 do not turn the lower cap back (counterclockwise) if desired setting is passed. Continue to turn in the clockwise direction past the "0" setting. Turning the cap back will render the fuze unserviceable. (Pages 3-30 and 3-31)

When setting the Mechanical Time and Superquick Fuze MS64 the Vernier scale is not to be utilized as incorrect usage in the past has resulted in gross timing errors. If necessary, fractional-second settings should be achieved by aligning the "0" mark between the desired whole-second graduations (refer to figure 3-18B). (Pages 3-30 and 3-31)

The following applies to Mk 29, Mk 30, and Mk 66 Point Detonating Fuzes. In no case should fuze setting screws be force& clockwise through the 3 o'clock (12 o'clock in the case of the Mod 5 of Mk 29 and Mk 30, or Mod 1 of Mk 66) stop or counterclockwise. A good rule for the initial setting from OFF to ON is never to turn the setting screw through an arc greater than 90'. For fuzes incor- rectly set to a position beyond 12 o'clock or for those being returned to stowage, a counterclockwise rotation back to the 12 o'clock ON position or back to the 9 o'clock (approximate) OFF position, respectively, is authorized. (Pages 3-41, 3-45, and 3-47)

A thin wax coating (tan in color) is applied at the factory to the VT-IR Fuze Mk 92 window mounted on the end of the fuze nose. This wax coating provides protection from the deposition of residue from blow-by gases during firing of the 3"/50 round and must not be removed. (Pages 3-107 and 3-108)

--

xvii


SAFETY SUIWARY (Continued)

CAUTION

For reasons of safety, black powders other than SNRP (such as Class 2, Class 6, or black spherohexagonal) mt not be used in torpedo impulse charges. These powders produce dangerous pressures in center line tubes when weight of charge is sufficient to cause the torpedo to clear the side of the ship. The small granulation size of Class 2 and Class 6 powders, when ignited, develops a sufficiently high pressure to cause the rupture of an expansion chamber, which is designed for the considerably lower pressure generated by sodium nitrate black powder (SNBP). (Page E-8)

-

xviii


CHAPTER 1

INTRODUCTION

--

l-l SCOPE AND PURPOSE

l-2 COVERAGE. This publication covers Navy gun-type ammunition used in guns larger than caliber .60, except that procured from the Army for use by Naval Units ashore. It includes some items closely associated with gun ammunition, but does not include fire control system, guns, and handling equipment which are not part of the ammunition items.

--.

l-3 This manual covers Navy gun-type ammunition in sizes 2Omm, 4Omn, 3”/50, 5”/38, 5”/54, 6”/47, 8”/55, 16”/45, and 16”/50. It also covers certain obsolete and obsolescent assemblies and items in other sizes . Component items of the above named sizes covered include explosives, projectiles, fuzes, primers, tracers, and propelling charges. Miscel- laneous components, detail parts, ammunition boxes ,- cartridge tanks; powder tanks, and fuze and primer cans are covered.

bag also

1-4 INTENDED USES. This publicat will be used by all Naval personnel

ion

engaged in the preparation, handling, and tactical use of Navy gun-type ammunition.

1-5 ARRANGEMENT OF MATERIAL

l-6 Specific information concerning ammunition assemblies, fuzes, primers, tracers, cartridge cases, special charges, ammunition containers, miscellaneous components, and obsolete or obsolescent it.ems is presented in separate chapters, primarily in tabular form. General or background information

is contained in appendices at the back of the book.

l-7 HOW TO USE THE MANUAL

l-8 Information about a specific subject pertaining to Navy gun-type ammunition may be located by looki.ng in the Table of Contents or in the List of Tables in the front portion of this manual.

1-9 Subject matter itself is arranged in easy- to- locate form by size, gun, Mark (Mk) and Mod number, and appl.ication. When specific data is not available, the applicable space in the table is marked ‘VA.”

l-10 CLASSIFICATION OF GUN AJ&llJNITION

l-11 CLASSIFICATION BY SIZE OF GUN. Gun munition is most commonly cl.assi- fied by the size of the gun in whi.ch it is used. In addition to designati.ons of bore diameter, such as 2Omn, 3-inch, or 16-inch, the length of the gun bore in calibers is also used as a means of classif ication. Thus a 3”/50 projectile is one used in a gun having a bore diameter of 3 inches and a bore length of 50 times 3 inches, or 150 inches.

1-12 CLASSIFICATION BY ASSEMBLY. The ammunition for the different type guns used by the Navy may be loaded as an assembly or as several units. See figure l-1.

1-13 Case Amrmnition. This class embraces every type of ammunition that uses a cartridge case to contain its

l-l

NAVORD OP 2215 VOLUME 1

SECOND REVISION -- -

PRIMER

PROJECTILE

R

--

Figure l-l. Types of Gun Amnunition: Fixed (top); Separated (center); and Separate-Loading (Bagged Gun)(bottom)

1-2

propellant charge. Case ammunition includes fixed and separated ammunition.

1-14 Fixed Ammunition. This class applies to -nition which has the

- /-\ cartridge case crimped around the base of the projectile. The primer is assembled in the cartridge case. The projectile and the cartridge case containing the primer and propellant charge all form one unit as a fixed round of ammunition. through 5”/25

&all caliber guns and guns caliber use fixed amnuni-

tion.

--

1-15 Separated Ammunition. This class applies to ammunition which consists of two units: the projectile assembly and cartridge case assembly. The projectile assembly consists of the projectile body containing the load, nose fuze, base fuze, and auxiliary detonating fuze, as applicable. The cartridge case assembly consists of the cartridge case, primer, propellant charge, wad, distance piece, and a plug to close the open end of the cartridge case. Separated ammunition is produced in gun sizes of 5”/38 through 6”/47 caliber and for some g-inch guns.

l- 16 Separate- Loading (Bagged Gun) Ammunition. _?_ This class applies to some g-inch gun sizes and to ,a11 gun sizes larger than 8 inches. This class does not contain a cartridge case; the pro- __ pellant charge is loaded in silk bags which are consumed during the combustion of the propellant when fired from the

- gun* The projectile, propellant charge, and primer are loaded separately.

- 1-17 CLASSIFICATION BY SERVICE USE. For economy and for safety, gun ammunition is assembled and classified according to the intended use as follows.

---

1-18 Service ,mition. This class applies to -ition used in combat. The projectiles contain explosive, illuminating, chaff, or chemical loads. Full propellant charges are used.

NAVORD OP 2215 VOLWE 1 SECOND REVISION

VT NON-FRAG projectiles are for target and training purposes and have a combination black powder and pyrotechnic color burst element. be used.

Reduced charges may

1-19 Target and Training Ammunition. This class applies to ammunition used for firing practice and training purposes . These inert-loaded projectiles are comparable in weight and configuration to those of service ammunition.

l-20 Dunmy Drill Ammunition. Thi.s class applies to any type of amnunition assembled without explosives, or with inert material substituted for explosives, to imitate service ammunition. This class of ammunition is used in training of personnel, or testing equipment. It is normally identified as dummy cartridges, dwrrmy charges, or dmy projectiles .

1-21 PRIWRY COMPONENTS OF AWIUNITION - ---

l-22 The primary components of Navy gun-type ammunition are as follows.

1-23 EXPLOSIVES. Explosives have extremely rapid rates of reaction, hence they are said to detonate. In gun ammunition high explosives are used as initiators, boosters, and bursting charges of projectiles. At one time explosives were commonly divided into two categories, designated “high explosives” and “low explosives.” High explosives were those which could be made to detonate. Low explosives were those which could be made to detonate only by applications of very strong shocks and whose use depended on some other characteristics usually that of bursting in a rapid, controllable, and reproducible manner. This classif ication is no longer used in connection with strictly military applications. In military application the term “high explosive” is still used but with a somewhat different meaning. Many of

l-3

NAVORD OP 2215 VOLU!E 1 SECOND REVISION

-- -

the so-called low explosives are now called propellants. See Appendix B for further description and general informa tion.

l- 24 PROJECTILE. The projectile is that component of ammunition which, when fired from a gun or launcher, carries out the tactical purpose of the weapon such as piercing armor, detonating on impact, or at a predetermined time after firing to cause damage to the target. Projectiles also are used to illuminate targets at night, or produce a chemical or smoke service as needed. See Appen- dix B for further description and general information.

1-25 FUZE. The fuze is designed to initiate the payload of a projectile. The different types of fuzes include mechanical, proximity, and impact (nose or base). See Appendix C for further description and general information.

l- 26 PRIMER. The primer is a small tube of sensitive explosive which initiates the propellant charge. See Appendix D for further description and general information.

1-27 TRACER. The tracer is a device which leaves a trail of flame or smoke to show the trajectory of a projectile See Appendix D for further description and general information.

1-28 PROPELLING CHARGES. Propelling charges are mixtures of explosives designed to propel projectiles, rockets, guided missiles, depth charges and torpedoes from guns and launchers to the target. Included in these charges are cartridges, bag charges, and special charges. See Appendix E for further description and general information.

l- 29 MISCELLANEOUS COMPONENTS

l-30 Miscellaneous components are those which are used in the assembly of gun- type ammunition but not covered in other categories assigned in this manual. They are illustrated in figure 1-2.

l-31 GAS CHECKS. Gas checks are copper rings with lead cores. These are assembled under pressure around the base fuze, base plug, and/or base fuze hole plug to prevent the propellant gases from entering the projectile. For information concerning shipboard inspection of gas check seals, refer to the Safety Summary of this publication or to Appendix F. Criteria to be followed when installing gas check seals or for pre- 1970 (uninspected, unsuffixed) loaded ammunition are also provided in Appendix F.

1-32 TRACER WASHERS. Lead washers are placed between the shoulder on the tracer body and the corresponding seating surface in the base fuze of the projectile. These washers prevent gases from affecting the base fuze or explosive filler.

l- 33 ADAPTERS. Adapters are used with projectiles to join auxiliary detonator and nose fuzes. They are also used to connect the nose fuze to the projectile.

-

1-34 PLASTIC AND CORK PLUGS. Plugs are used in the mouth of cartridge cases in the assembly of propellant charges. They seal the end of the cartridge case and act as a buffer when the case is rammed into the gun against the projectile.

--- -.

l-35 WAD. Thi.s is a cardboard or pyralin disk which is forced into the cartridge case on top of the propellant powder to retain the powder in position. Pyralin wads are usually used in special charges ; such as saluting, torpedo, and single depth charge projectors. When the pyralin wad is used, it is cemented in position.

1-36 DISTANCE PIECE. This is a rectangular piece of cardboard folded into a triangular shape. It is used in the cavity of the cartridge case and is inserted between the wad and the plug to act as a support between the wad and plug in separate loaded ammunition. In fixed ammunition the distance piece is

l-4


SECOND REVISION

Figure 1-2. Miscellaneous Gun Ammunition Components and Details

l-5


inserted between the wad and the base of the projectile.

l-37 LEAD FOIL. A piece of lead foil is placed inside the distance piece, when required, to prevent the deposit of copper fram the projectile rotating band in the bore of the gun. It is also used in bag charge ammunition for the same purpose.

l-38 FIJZE CAVITY LINER. This is a thin metal liner which is inserted in the fuze cavity of the projectile. It is used for VT fuze applications.

l-39 HANDLING AND SHIPPING PARTS

l-40 Handling and shipping parts are items which are used to protect or provide support during handling, shipping, and storage of gun ammunition. These items which are considered serviceable are usually returned to an ammunition depot. They shall be packed in the prescribed rranner and contents identified.

1-41 SPACERS. Spacers are made of cork, cardboard, or wood in various thicknesses and are placed inside the ends of cartridge tanks and powder tanks to prevent longitudinal movement of the cartridge case or pohnler bag.

l-42 CARTRIDGE EXTRACTORS. These are light metal cups shaped to fit the base end of cartridge cases. They have a handle or a sash cord to facilitate removal of the cartridge case from the cartridge tank. The extractor protects the primer in addition to providing a means of removing the case from the tank.

1-43 WTERPROOFING PROTECTING CAPS. These are metal caps threaded internally to fit mating threads on the exterior of the nose of the projectile. The cap helps protect a nose fuze from damage by moisture or by shock in handling. These caps are attached by thread to separated and separate-loaded proj ec- tiles; they are soldered lightly (and

l-6

removed by tear strips) on ST’/25 medium- caliber fixed rounds. The caps are installed at the depot and are removed just prior to the time the projectiles are loaded into the hoists aboard ship.

l-44 PROJECTILE AND CARTRIDGE NOSE SUPPORTS. These are placed in a cartridge tank for fixed amnuni tion to support the projectile and prevent movement. They are lightweight tubes with flanges for positioning.

1-45 GROWETS. These are rectangular pieces of heavy fiber, canvas, or leather provided with laces or other means for securing to the rotating bands of projectiles. Grommets protect the copper rotating bands during handling and storage of 6-inch through 16-inch projectiles.

l-46 AMMUNITION DATA CARDS. Ammunition data cards are prepared for each amnunition lot produced or renovated. The information on the data card is used by ammunition depots and by using activi- ties. Data cards are supplied with each shipment of ammunition and are usual.ly placed inside the protecting cap for projectiles, inside cartridge tanks, and inside bag-charge tanks and ammunition shipping boxes, as applicable.

1-47 AMMUNITION CONTAINERS

l-48 The projectiles for separated and bagged gun ammunition are not shipped in containers. Their parts which are most susceptible to damage--nose fuzes and rotating bands-- are protected, respectively, by caps and grommets. Car- tridges for separated ammunition, bag charges, fixed ammunition, and some nose fuzes are shipped and stored in containers. Cartridges for separated anmunition and bagged charges are packaged individually in tanks; small- caliber fixed ammunition is shipped collectively in boxes.

l-49 Separate components, such as some nose fuzes and primers for bag gun loads, are shipped individually in

NAVORD OP 2215 VOW 1 SECOND RFWISION

Pigure l-3. Typical Box-Type Containers: 2Omn Cartridges (Left) and 4Omm Cartridges (Right)

hermetically sealed cans, a number of such cans being placed in a wood box.

-

l-50 All gun <ammunition components in their containers mry be assembled into unit loads on metal or wood pallets for handling with powered equipment. Pro- jectiles 12-inch and larger in caliber are not palletized.

1-51 AWUNITION BOXES. (See figure l-3.) Metal boxes with gasketed covers are used as containers for 2Omm and 40mm ammunition. The covers are clamped to the boxes with latches or they may have hinges and latches.

l-52 Some larger caliber fixed ammunition is supplied in wood boxes to ships whose storage will not accommodate the cartridge tanks. Most of the larger caliber fixed ‘ammunition is shipped individually in cartridge tanks.

l-53 CARTRIDGE TANKS. (See figure l-4.) These steel or alumillrm tanks are provided with reinforcing rings around their ends. The rings allow an interlocking arrangement when stored horizontally in rows. The side walls are relatively weak and are not designed to support super-imposed weight. The tops of the tanks are closed by a metal cover bearing on a rubber gasket. The cover has a bail to facilitate installation and removal. A length of wire attached to the cover and to the body of the tank prevents the cover from loosening. Usually, an inspection of this wire will indicate whether the tank cover is tightly secured. The tanks are air-tight when properly closed. Tanks for fixed cartridges are provided with interior supports for the noses of the projectiles.

1-54 POWDER TANKS. Powder tanks are fabricated of aluminum to reduce

l-7

NAVORD OP 2215 VOLUME 1 SECOND REVISION --

Figure 1-4. Typical Tank-Type Containers: (left to right) 8-Inch Bagged Charge, 5"/54 Cartridge, 3"/50 Cartridge, and 5"/38 Cartridge

1-8

sparking danger, storage weight, and facilitate handling; however, some steel tanks with brass top rings are still in use. Each powder tank contains one or several powder bags. Powder tanks in general are constructed in the same manner as cartridge tanks; the requirements for air-tightness are the same. All powder tanks have handling aids. Large tanks have lugs which fit slings; smaller ones have handles. Wrenches are supplied for tightening the covers on powder tanks. Only the wrench furnished for the particular tank should be used. A smaller wrench might not sufficiently seat the cover in the gasket; a larger one might carry away part of the cover or tank.

-

-' h_

1-55 Reduced-charge powder charges may be tanked in one of several different ways. They may be in full-charge powder charge tanks, with or without adapters, or they may be in powder charge tanks designed for reduced charges. Regardless of how tanked, it is necessary that all movement of the charge within the tank be eliminated in order to avoid the danger of fire or explosion from an

--


internal static electrical spark discharge. To this end it is mandatory that the wooden spacer, with cardboard spacer on top, be in the bottom of each tank containing a powder bag charge, and all other space be filled by placing cardboard spacers between the top of the charge or section and the tank lid. In closing the tank, it should be necessary to put a slight pressure on the lid to get it to engage its locking grooves.

1-56 Special tanks are supplied for bulk smokeless powder which replaces powder taken from ammunition for testing. These are called replacement sample tanks. They are cutdown 4-inch or S-inch cartridge tanks or specially designed aluminum powder tanks.

l-57 FUZE AND PRIMER CANS. These are hermetically sealed cans which are used for shipping and storing of fuzes and primers. The cans are sealed by a tear strip or threads, and shipped in a suitable box with cradle supports to prevent the cans from shifting.

l-58 OTHER PUBLICATIONS FOR REFERENCE

l-59 The following documents provide additional information for the ordnance items described in this publication:

NAVORD OP 4, Volume 2 . . . . . . . . . . . Ammunition Afloat

NAVORD OP 5, Volume 1 . . . . . . . . . . . Ammunition Ashore; Handling, Stowing, and Shipping

NAVORD OP 1480 . . . . . . . . . . . . . . VT Fuzes for Projectiles and Spin Stabilized Rockets, Special VT Fuzes

NAVORD OP 1714 . . . . . . . . . . . . . . Selection of Projectiles and Fuzes for Attack of Ship and Shore Targets

NAVORD OP 2215, Volume 2 . . . . . . . . . Navy Gun-Type Anununition

NNORD OP 3658 . . . . . . . . . . . . . . Rocket Assisted Projectile (Ffl) Ballistic Slide Rule for Use with Computer Mk IA, Mod 13

1-9


NAVORD OD 17190 .............

NAVORD OD 28654 .............

NAVORD OD 28655 .............

NAVORD OD 41548 .............

NAVORD OD 41896 .............

NAVORD ORDALT No. 6004 .........




N4VORD ORDALT No. 6926 .........



NAYVORD ORDALT No. 6970 .........

NKVORD ORDALT No. 6971 .........

Unserviceable, Suspended, and Limited Use Ammunition

Assembly Procedures for Fuze and Adapter Assemblies Mks 357, 358, 359, 365, 366, 367, 369, 370, and 371

Assembly Procedures for Fuze and Adapter Assemblies Mks 360, 361, and 362

Assembly Procedures for Fuze and Adapter Assembly Mk 357 Mod 0 and Installation into 5"/38 Caliber Rocket Assisted Projectile Mk 57 Mod 0

-

Slide Rule for Rocket Assisted Projectile (RAP) Computer Mk 47 Mods 3, 4, 5, 6, 7, 8, 9, 10

5'*/54 Ballistic Slide Rule, Computer Mk 47 Mods 5 and 7

5"/54 Ballistic Slide Rule, Computer Mk 47 Mods 8 and 9

-

5"/54 Ballistic Slide Rule, Computer Mk 47 Mods 3 and 4

5"/38 Caliber Gun Mounts, Projectile Hoists Mk 2 and Mk 4 (Urgent)

5"/54 Autcxnatic GFCS, Mk 47 Mods 8 and 9

5"/54 Automatic GFCS, Mk 47 Mods 5 and 7

5"/54 Automatic GFCS, Mk 47 Mods 10 and 11

5"/38 Ballistic Slide Rule

5"/38 Automatic GFCS

MIL-HDBK-137 . . . . . . . . . . . . . . . Military Standardization Handbook, Fuze Catalog, Volume 1

NWIPZO-2 ................ Naval Warfare Information Publication Naval Weapons Selection-Ships

NWL Ballistic Table No. 182 ....... 5"/38 RAP Range Table

NWL Ballistic Table No. 185 ....... 5"/54 RAP Range Table

l-10

- =a->


-

AMMUNITION ASSEMBLIES -

2-l ORGANIZATION OF DATA

CHAPTER 2

2-2 Fixed, separated, and separate- loading Navy gun-type armnunition assemblies are arranged in tables 2-l through 2-35 according to the size of gun, Mk and Mod numbers, and type of amnunition. - --

NOTE

--

-- h_

The 6”/47 ammunition is further categorized according to its use in SP (single-purpose) or DP (dual-purpose) guns. SP guns are slow fire and intended for bombardment use only. DP guns are rapid-fire and intended for both bombardment and antiaircraft use.

-- The ammunition table for each size is followed by a second table covering

propelling charges, and usually by a third table covering dwrrmy rounds. Because of the special nature of the RAP (Rocket Assisted Projectile) rounds, they are covered separately in table 2-36. An extensive description of the RAP is provided in paragraphs 2-5 through 2-27.

2-3 FURTHER REFERENCES

2-4 Appendix B contains general information pertinent to projectiles . Appendix E covers propelling devices. Refer also to Appendix F, which provides gas check seal inspection criteria for projectiles assembled with base fuzes or base fuze hole plugs; and to Appen- dix G, which provides procedures for removing or replacing nose fuzes on projectiles aboard ship.

2-l


SECOND REVISION

2-2


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--

- --

-

SECOND REVISION

2-3


SECOND REVISION

2-4


SECOND REVISION

-

- --

-

-

--

-

-

2-5


SECOND REVISION

2-6


SECOND REVISION - .--.

2-7

-

-

-

-

-

- -


-

-

2-8


SECOND REVISION

- --.

--

-

2-9

-


SECOND REVISION - -

Z-10

-

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SECOND REVISION

2-11


SECOND REVISION

-

3 rc

-

P :

3

3

-

8l 2 E

i2

--

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-- --

2-12

-

- =-

-

-

-


SECOND REVISION

2-13


SECOND REVISION

\ 44Y wmm n

-


SECOND REVISION

= -

-

-

2-15


SECOND REVISION

n


-

-

_-

-

-


SECOND REVISION

2-18


SECOND REVISION

- --

-

2-19


SECOND REVISION

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d

-

-

2-20

-


SECOND REVISION - --I

-

-

-

-

n


SECOND REVISION

--

2-22 -

-

--


-

- --

-

-


SECOND REVISION

2-24


SECOND REVISION

--

-


SECOND REVISION

2-26

-

--

-

-

- --

-

-

--.

-


SECOND REVISION

2-27


SECOND REVISION

--

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2-28


SECOND REVISION - --

l-4

-

-1

--

n ~2 n n n 13 n

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- 2-29


SECOND REVISION

2-30


-

-

n

2-31

-


SECOND REVISION

2-3 2


SECOND REVISION

-

--=

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2-33

NAVORD OP 2215 VOLU% 1 SECOND REVISION

2-34 _

$38 MK 57 MODS 0 ‘AND 1 ROCKET ASSISTED PROJECTILE (RAP)

2-6 The St/38 RAP, figures 2-l and 2-2, is an addition to rather than a replacement for existing gun-type amnunition. The primary use for RAP is against enemy shipping at extended ranges. Operational skill and maintenance level required aboard firing ships will be the same as for similar type existing gun systems. RAP will remain in the Fleet indefinitely as an extended range gun-fired projectile. Table 2-36 lists the general data on 5”/38 RAP projectiles.

2-7 DESCRIPTION. Each round consists of a projectile and a gun cartridge (full charge). The projectile consists

/

r;lvKzzrJI’

/

MK 74 MOD 0 WARHEAD


of a solid-propell.ant rocket motor with a delayed igniter, and explosive-f illed warhead, and a CVT fuze .

2-8 The 2-inch increased length of the Y/38 RAP presents an interface problem with gun mount and hoist operations. This problem is covered by modifications described in ORDALT No. 6827 for S-inch caliber gun mounts and projectile hoists Mk2andMk4. Special reversible battens are also required in shipboard magazines to accept the 5”‘/38 RAP.

2-9 This special purpose Navy gun-type ammunition will be used with manual inputs to gun-fire control systems (GFCS) using a 5”/38 ballistic slide rule (refer to OP 3658) covered by

VIBRATION DAMPER PAD

GRAIN SPACER PAD

MK 82 MOD 0 PROPEL RAIN SEGMENT

PREFORMED PACKING

PROPELLANT GRAIN

BANDED MOTOR

L GRAIN WAC’AC;~;~~~

JAN1

279 IITER

r

MOD 1

SECTION: A-A GAS CHECK GASKET ’

Figure 2-l. St’/38 Rocket Assisted Projectile (RAP) Mk 57 Mod 1, Cutaway View

2-35


-

w-

2-36


--

ORDALT No. 6970 in initial firing ships. ORDALT 6971 covers 5"/38 autoTnatic inputs to GFCS in the final installa- tions.' Range tables currently available for use with RAP are listed in paragraph

-- l-59 of this publication.

2-10 MINIWM RANGE, The minimum range for 5"/38 RAP is 15,000 yards if a proximity fuze function is desired or automatic GFCS direction is required. To prevent early initiation of proximity fuzes by rocket exhaust emission, the fuze is set to begin to transmit 5 seconds after rocket burnout. For PD fuze action, the minimum range is restricted only by minimum safe separa- tion; however, GFCS control is limited.

--

-

2-11 SAFETY AND TRAINING. RAP presents no additional hazards or safety problems to the Fleet. Safety requirements for existing projectiles with explosive warheads will apply to the RAP round. RAP incorporates, to the maximum extent

possible, irnrmnity to accidental detonation of fuze or igniter components by high-energy radiation or shipboard electromagnetic fields. Operational safety precautions will be exercised with RAP fuze components as are pre- sently required with similar components now in the Fleet,

CAUTION

Btreme caution must be used in firing operations. Insure the correct identification of RAP projectiles in view of the similarity of projectile appearance and the dissimilarity of impact points of RAP compared to standard projectiles.

2-12 CVT FUZES FOR 5"/38 RAP. For a detailed discussion of CVT fuzes refer to Chapter 3 and Appendix C of this publication.

FUZE

-

-

--

BOURRELETS

I I I COLOR ZONE C ZONE ZONE CODING

TO INCLl JDE B A OACC ZONE A - YELLOW ““IL

ZONE B - OLIVE DRAB

ZONE C -BROWN

Figure 2-2. St'/38 RAP Mk 57 Mod 1, External View

2-37


Before firing CVT-fuzed projectiles over friendly forces, check the time setting on the fuzes. The estimated time-to- target must be accurately determined and the fuze set to this time to prevent possible VT airbursts from occurring above the deployed friendly forces.

CAUTION

CVT fuzes nust be set to 35 seconds or more when used in S-inch Rocket Assisted Pro- jectiles. If fired at settings less than 35 seconds, the fuzes may function early as a result of rocket motor effects on the fuze.

2-13 CVT Fuze and Adapter Assembly Mk 357 Mod 0 is the U. S. Army model M514Al Proximity Fuze adapted to U. S. Navy projectiles, including 5"/38 standard and RAP. An adapter assembly is required for making the M514Al fuze compatible with Navy projectiles; when this fuze is used in the adapter, it is designated 'Fuze and Adapter Assem- bly." Mk 357 Mod 0 Fuze and Adapter Assemblies as shipped from the depot are preset, installed in projectiles, and are normally fired at the depot setting. However, if tactical operations should require other settings, such as when firing over friendly forces or when encountering electronic jamming, these fuzes may be reset aboard ship as required. Since Mk 357 fuze and adapter assemblies are not compatible with Navy automtic fuze setters, they mxst be reset using hand tools,

Do not use the PD setting on Mk 357 fuze and adapter assemblies. An inaccurate PD setting will not guarantee that the proximity circuits will remain

inactive (unarmed) after the round is fired. For PD functioning only, set the fuze to 95 seconds to achieve positive PD action. At this setting of 95 seconds, the proximity circuits will not become armed for at least 92 seconds and the round will be safe for firing over friendly troops for this time.

2-14 CVT Fuze Mk 338 Mod 0. Fuze Mk 338 Mod 0 is the first U. S. Navy CVT fuse designed specifically for shore bombardment use against personnel and light materiel targets. Unlike the adapted M514Al Army proximity fuze, the Mk 338 Mod 0 CVT fuze is compatible with Navy automatic fuze setters and can be set automatically as required for various tactical operations. This fuze, as shipped from the depot, is installed in projectiles set in the PD setting (and shipping) zone.

CAUTION

If fired at settings less than 35 seconds in RAP, the fuze may function early as a result of rocket motor effects on the fuze.

2-15 IGNITER MK 279. A gun gas- triggered, percussion-actuated delay igniter sealed into the motor case base with a gas check gasket is blown out upon motor ignition. Gun gas pressure flexes a belleville spring which strikes a percussion primer assembly, initiating the pyrotechnic delay column. After a 23-second delay, the delay column burns the ignition charge which ignites the propellant grain in Rocket Motor Mk 62. Figure 2-3 shows the details of Igniter Mk 279 Mod 1 used in the 5"/38 RAP Mk 57 Mod 1. This igniter replaces the Mk 279 Mod 0 in all RAP rounds produced after July 1969. The Mod 1 incorporates a more sensitive primer for reliability, and structural changes in the spring/

2-38

NWORD OP 2215 VOLWE 1 SECOND REVISION

- -A-

--

-

retainer area which provide a greater safety factor in event of a&dental drop.

2-16 STORING AND HANDLING. All safety precautions normally observed in storing and handling gun-type ammunition shall be observed.

tiring handling of RAP, a drop in excess of 24 inches on the base of the projectile in which a deck pin, (rivethead) bolt, or miscellaneous object strikes the center hole of the igniter, sufficient striking energy could be provided to actuate the igniter. In this event, ignition of the rocket motor may be delayed 20 to 30 seconds. All personnel should immediately evacuate the area. Do not attempt disposal prior to rocket motor ignition. If rocket motor burns in a closed compartment, insure that the area is clear of fumes

prior to re-entry. Dispose of the projectile in accordance with standard EOD practice.

2-17 Handling. Handle projectiles carefully at all times. Avoid jarring or dropping components. Any anmunition components dropped more than 24 inches should be considered defective and turned over to authorized ordnance disposal personnel for disposition. Components dropped less than 24 inches should be examined carefully for external damage. If no damage is evident, the ammunition components may be considered safe for use and operable.

2-18 Temperature Limits. RAP is subject to the same operational temperature limits *as are standard projectiles.

2-19 Storage. Storage conditions and ammunition magazines for RAP shall meet the same reqirements applicable to standard projectiles. RAP may be stored with standard projectiles in the same hazard classification.

IGNITER OUTPUT CHARGE

-

- -

-

Figure 2-3. Igniter Mk 279 Mod 1, Cutaway View

2-39

NA.voRD OP 2215 VOLUME 1 SECOND REVISION

Z-20 SAFETY PRECAUTIONS. Safety precautions for RAP fuzes are--covered by safety requirements for fuzes used with standard projectiles, Do not tamper with or attempt to repair any part of the round. If the projectile is damaged or determined to be defective, mark the defective part for return to an issuing activity, or dispose of the part as a hazardous item according to current directives for explosive ordnance materials.

2-21 5"/54 PROJECTILE (RAP) MK 58 MOD 0

2-22 DESCRIPTION. The configuration and components of the 5"/54 Mk 58 Mod 0 RAP round are shown in figure 2-4 and table 2-36. The description of the 5"/38 RAP round given in paragraph 2-7 and the color coding shown in figure 2-2 also apply to the 5"/54 RAP round. No increase in length over that of the conventional 5"/54 projectile was necessary in the design of the RAP, therefore, no modifications to gun mounts, projectile hoists, or battens in shipboard magazines are required. This special purpose Navy gun-type ammunition will be used with manual gun-fire control systems (GFCS) and a 5"/54 ballistic slide rule (refer to OD 41896) in initial firing ships. The automatic GFCS ORDALTS and 5"/54 range tables are listed in paragraph l-59 of this publication.

2-23 MINIMUM RANGE. The minimum range for 5"/54 RAP is 20,000 yards if a proximity fuze function is desired or automatic GFCS direction is required. To prevent early initiation of proximity fuzes by rocket exhaust emission, the fuze is set to begin to transmit 5 seconds after rocket burnout. For PD fuze action, the minimum range is restricted only by minimum safe operation; however, GFCS control is limited.

2-24 SAFETY AND TRAINING. Refer to paragraph 2-11.

2-25 CVT FUZE FOR 5"/54 RAP. For a detailed discussion of CVT fuzes

refer to Chapter 3 and Appendix C of this publication.

Before firing CVT-fuzed projectiles over friendly forces, check the time setting on these fuzes. The estimated time-to-target must be accurately determined and the fuze set to this time to prevent possible VT airburst from occurring above the deployed friendly forces.

CAUTION

CVT fuzes must be set to 35 seconds or more when used in 5-inch Rocket Assisted Pro- jectiles. If fired at settings less than 35 seconds, the fuzes may function early as a result of rocket motor effects on the fuze.

CV'T Fuze and Adapter Assembly Mk 360 Mod 0 is the U. S. Army model M514Al proximity fuze adapted to U. S. Navy 5"/54 standard projectiles and 5"/54 RAP. An adapter assembly is required for making the M514Al fuze compatible with Navy projectiles. When this fuze is used in the adapter, it is designated "Fuze and Adapter Assembly." When used in 5"/54 projectiles, the fuze and adapter assembly ogive complete the ballistic shape of the projectile without the use of a plastic windshield. Fuze and Adapter Assem- blies Mk 360 Mod 0 as shipped from the depot are preset, installed in projectiles, and are normally fired at the depot setting. However, if tactical operations should require other settings, such as when firing over friendly forces or when encountering electronic jamming, these fuzes may be reset aboard ship as required. Since Mk 360 fuze and adapter assemblies are not compatible with Navy

-

--- -

-

-

-

2-40

--


automatic fuze setters, they must be reset using hand tools.

-

Do not use the PD setting on Mk 360 fuze and adapter assemblies. An inaccurate PD setting will not guarantee that the proximity circuits will remain inactive (unarmed) after the round is fired. For PD func-

---

tioning only, set the fuze to 95 seconds to achieve positive PD action. At this setting of 95 seconds, the proximity circuits will become armed for at least 92 seconds and the round will be safe for firing over friendly troops for this time period. However, at long

-

-- -.

-

-

=-.

MK 78 WARHEAD

range, the flight time of the 5"/54 RAP is greater than 95 seconds.

2-26 IGNITER MK 279 MOD 1. A gun gas- triggered, percussion-actuated delay igniter sealed into the motor case base with a gas check gasket is blown out upon motor ignition. Gun gas pressure flexes a belleville spring which strikes a percussion primer assembly, initiating the pyrotechnic delay column. After a 23-second delay, the delay column burns the ignition charge which ignites the propellant grain in Rocket Motor Mk 64 Mod 0. Figure 2-3 shows the details of the Mk 279 Mod 1 Igniter.

2-27 STORING AND HANDLING. Refer to paragraph 2-16 for storage and handling data on the RAP rounds.

SECTION: A-A

Figure 2-4. 5"/54 RAP Mk 58 Mod 0, Cutaway View

2-41/2-42 blank

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--

--

IUVORD QP 2215 VOLUME 1 SECOND REVISION

CWPT.ER3

FUZES

-

--

-

3-l ORGANIZATION OF DATA

3-2 Fuzes listed in tables 3-l through 3-8 are devices with explosive components designed to initiate a train of fire or detonation of the main explosive charge of the projectile. Boosters are listed in table 3-9. Fuzes for projectiles are identified according to their location in the projectile, as nose or base fuzes. They are also separated into five types, according to the manner in which they function:

-

ba: Mechanical Time Fuzes (MTF) Point Detonating Fuzes (PDF) Base Detonating Fuzes (BDF)

i: Auxiliary Detonating Fuzes (ADF) e. Proximity Fuzes (VT)

Each of these types are listed in this publication by Mk and Mod number. In some instances, the List of Drawings (LD) number given may be a Parts List (PL) or Data List (DL) number. The drawing number given is either a General Arrangement Drawing (in the case of older drawing numbers) or an Assembly Drawing (for the newer drawings).

3-3 FURTHER REFERENCES

3-4 For additional information on the description, operation, and safety features of the fuzes, refer to Appendix C.

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-

3-1

NAVORD OP 2215 VOIkJME 1 SECOND REVISION '

I

-

_~

Figure 3-1. Mechanical Time Fuze Mk 25 Mod 5, External View

=--

Figure 3-2. Slider-me Escapement Release of Mechanical Time Fuze Mk 25 Mod 5

3-2

NAVOPD OP 2215 VOLUME 1 ‘SECOND REVISION

--

-

- --

-

--

L Table 3-1. Mechanical Time Fuzes

MK 25 MK 25 MOD 4 MOD 5 -

Used in Projectile 5”/54 AAC, ILLUM, WP; and 6”/47 PAC 6 ILLUM

LD 272858 293347 Drawing 863155 1378972

Thread Size (in.) Intrusion Depth (in.)

1.700-14NS-1 0.805

1.700-14NS-1 0.805

Overall Length (in.) 4.585 4.581 Weight (lb.) 1.450 1.450

Time Delay (sec. max.) 45 45

Explosive Components: Primer Either F.A. 70

Primer Mix or F.A. 70 Primer Mix modified to contain 8% ground glass

Either F.A. 70 Primer M.ix or .44 grain of No. 529 Winchester Primer Mix

Booster Black Powder

3-5 MECHANICAL TIME FUZES (MTF)

-- 3-6 MK 25 MTF. Both mods of the Mk 25 are obsolescent and will be superseded by Mk 342 Mod 0.

-

-

--

a. Mod 4 is similar to the typical MTF described in Appendix C except that luting compound or varnish is used for moisture-proofing instead of a gasket under the upper cap; its external shape is different, and slots instead of lugs are used for setting; the rotation of the clockwork is the reverse of that illustrated in Appendix C; and a safety lever detent retained by a flat spring is used instead of a safety lever plate as the escapement release.

b. Mod 5, figures 3-1 and 3-2, is

Black Powder

similar to the Mod 4 except that its firing arm is especially hardened; a setback pin is retained by the firing plate safety pin only; a premature trap has been incorporated in the timing disk; and a slider-type escapement release replaces the Mod 4-type safety lever detent assembly. When the setback pin is moved aft on acceleration of the projectile, the safety lever, figure 3-2, may then move outboard under the impetus of centrifugal force. The safety lever spring holds the safety lever inboard until centrifugal force overcomes the spring. When the safety lever moves outboard, the pin on the after side of the safety lever moves clear of the escapement lever. The escapement lever is then free to start its oscillation.

3-3

NAVORD OP 2215 VOLUME 1 SECOND REVISION,

Figure 3-3. Mechanical Time Fuze Mk 50 Mod 8, Ekternal View

3-4

NAVORp OJ’ 2 215 VOLUME 1 ’ SECOND REVISION

3-7 MK 50 MTF. This fuze should not be used in conjunction with the 5”/38 reduced charge since the setback force produced is not always sufficient for arming. All mods will be superseded

-- by Mk 349 Mod 0.

a. Mod 0 is similar to the typical MTF described in Appendix C - except that a safety lever plate is used instead of a safety lever detent as the escapement release; a setback

- pin is used instead of a firing pin safety block as a release for the firing pin; and its tensioning wire is separated. The lowest setting for the Mod 0 is 2.8 seconds.

-I-

- Y

-

b. Mod 1 is similar to the Mod 0 except that the tensioning wire is not serrated and some of its parts are interchangeable. Mod 2 is similar to the Mod 0 except that one plate and three spacers are combined in one brass forging. The lowest time setting for the Mod 2 is 0.6 second. Mods 3 and 4 are similar to Mod 2 except for the single-setting feature.

Mod 5 is the designation for a ntm$r of reworked modified Mk 18 time fuzes Mods 2, 3, and 4. The moistureproof ing was accomplished as follows:

1. A desiccant unit, consisting of silica gel in a porous container, was inserted in the base cavity of the fuze body. The silica gel absorbs and retains moisture in the air entrapped in the fuze at assembly, thus preventing the rusting of steel parts or deterioration of explosive components.

2. Special gaskets were inserted between the upper and lower caps and between the lower cap and the body to prevent the entrance of moisture .

3. The brass disk at the center of the bottom closing screw was crimped- in under a washer and coated with varnish.

4, All screw heads visible on the exterior of the fuze body were coated with a glyptal lacquer.

5. The hole for locating the tensioning wire was drilled blind from the inside of the lower cap.

d. Mod 7 was redesigned throughout. It is similar to the typical MTF described in Appendix C except for a spring on the firing-arm shaft which facilitates assembly, and a zero adjust- ment in the timing disk. The Mod 7 has a 20-tooth escapement gear, firing pin safety block, and safety lever detent.

e. Mod 8, figure 3-3, is similar to Mod 7 except that the firing arm is hardened and a slider-type release, figure 3-4, replaces the safety lever on the escapement lever. The slider-type release operates in the following manner. When the setback pin is moved aft on accelerati.on of the projectile, the safety lever may then move outboard under the impetus of centrifugal force. The safety I-ever spring holds the safety lever inboard until centrifugal force overcomes the spring. When the safety lever moves outboard, the pin on the underside of the safety lever moves clear of the escapement lever. The escapement lever is then free to start its oscillation.

3-5

N/WORD OP 2215 VO&ME 1 SECOND REVISION'

WEIGHT WEIGHT ELBOW ELBOW

FlRlNG PIN SPRING

SETBACK PIN SETBACK PIN FIRING ARM SHAFT

FIRING PIN SAF\ETY PLATE

SAFETY ‘LEVER SPRING

\

SAFETY LEVER PLATE

\

ADJUSTING SCREW ACK PIN

ADJUSTING NUT ESCAPEMENT LEVER ESCAPEMENT SPRING ADJUSTING NUT

-- -

-

Figure 3-4. Details of Mechanical Time Fuze Mk 50 Mod 8: Firing Pin Assembly (top) and Slider-Type Escapement Release (bottom)

3-6

-

--

-F

--

--

-

_

-- , \

_

NAvoFxl OP 2215 VOLUME 1 SECOND REVISION

Table 3-1. Mechanical Time Fuzes (Continued) :_

Jsed in Projectiles

LD 1rawing


hrerall Length (in.) tieight (lb.)

I'ime Delay (sec. max.)

Explosive Components: Primer

Y/38 AAC, HI MT, ILLUM, w

284626 165357 NA 561740

F, WP; 6 6"/47

165358 561716

I LUJM

NA 581879

1.700-14NS-1 1.700-14NS-1 1.700-14NS-1 1.700-14NS-1 0.803 0.803 0.803 0.803

4.308 4.308 4.308 4.308 2.280 2.280 2.280 2.280

45 45 45 45

Either F.A. 70 Primer Mix or F.A. 70 Primer Mix modified to contain 8% ground glass

Booster Black Powder Black Powder Black Powder I Black Powder

MK 50 MOD 0

--___ MK 50 MK 50 MK 50 50 MOD 4 MOD 5 MOD 7

-? MK MOD 8 ._____-_

5"/38 AK, HE-MT, ILLUM, W, 6 WP; 6 6'"/47 ILLUM Jsed in Projectiles

LD Drawing


Overall Length (in.) Weight (lb.)

Time Delay (sec. max.)

165359 299218 561990 561715

1.700-14NS-1 1.700-14NS-1 0.803 0.803

4.308 4.308 2.280 2.280

45 45

291701 295860 1370527 3 13789795

1.700-14NS-1 1.700-14NS-1 0.803 0.803

4.308 4.308 2.280 2.300

45 45

Explosive Components: Primer 1 Either F.A. 70 Primer Mix ( * F.A. 70 Prime Mix

modified to contain 8% ground glass

Booster Black Powder Black Powder Black Powder Black Powder

3-7


Figure 3

I w w

'-5. Mechanical Time Fuze Mk 51 Mod 2, Exter ma1 View

3-8

-

__

--

-

-

-

-

--


Table 3-l. Mechanical Time Fuzes (Continued)

Jsed in Projectiles

LD 1rawing

II-read Size (in.) Intrusion Depth (in.)

3verall Length (in.) #eight (lb.)

rime Delay (sec. max.)

Explosive Components: Primer

MK 51 MK 51 MK 51 MOD 0 MOD 1 MOD 2 -.

3"/50 At4 3"/50 AA 3"/50 AA 4 ILLUM 6 ILIUM 4 ILLUM

SK 109439 SK 165356 SK 109512 561806 561819 561992

1.700-14NS-1 0.810 0.803 0.803 0.803 0.803

4.550 4.543 4.543 4.543 4.545 1.320 1.320 1.320 1.320 1.320

30 30 30 30 30

Either F.A. 70 Primer Mix or F.A. 70 Primer Mix modified to contain 8% ground glass


Black Powder

Black Powder

Black Powder

Black Powder

3-8 MK 51 MTF. Mk 51 fuzes, figures cavity of the fuze body. This unit 3-5 and 3-6, are a waterproofed design absorbs and retains all moisture in based on Mk 22 fuzes. They are similar the air entrapped in the fuze at to the typical MTF described in assembly or reassembly. Appendix C. Mk 51 fuzes are unique among Navy MIFs in that the lower cap and body are designed for low-to-high settings instead of high-to-low settings.

a. Mods 0 through 4 are obsolescent. They are practically identical to one another, and the assignment of different mod designations reflects the different manufacturers assigned to their production or reworking. Mods 0, 1, and 2 were waterproofed at the time of manufacture; Mods 3 and 4 were Mk 22 fuzes called in from depots and reworked to make them waterproof. To insure water- tightness, the following features are embodied in Mods 0 through 4.

1. An internal desiccator unit of silica gel is placed in the base

2. Gaskets are used between the upper cap and the lower cap, and between the lower cap and the body.

3. A coating of waterproofing varnish is applied externally over the gasketed joint between the upper and lower caps.

4. The primer screw assembly is moistureproofed by a vinylite disk inserted under the black pokier relay pellet, and by the coat of waterproofing varnish over both ends of the primer screw assembly.

5. The joint between the body and the bottom closing screw is packed with thread luting compound.

3-9

-


-

CENTRIFUGAL GEAR

CENTRIFUGAL WEIGHT

Figure 3-6. Details of Mechanical Time Fuze Mk 51 Mcd 2: Centrifugal Gears (top); Setback Pin (center); and Safety Lever Plate (bottom)

-

3-10

- ;->

-

-

-A

-

-1

- --%

6. The brass disk at the center of the bottom closing screw is crimped under a washer, and coated with waterproofing varnish.

7. A coat of gylptal lacquer is applied to all screw heads on the outside of the fuze body.

8. The hole for securing the tensioning wire is blind-drilled from the inside of the lower cap.

b. Mod 5 embodies several design improvements. Waterproofing is accomplished in the same manner as in the case of Mods 0 through 4 except:

1. There is a plastic gasket between the lower cap and the body only.

2. Thread luting compound has been used to pack the joints between the upper and lower caps and between the body and the bottom closing screw.

3. Waterproofing varnish has been applied over the joints between the upper and lower caps and between the body and the bottom closing screw.

In addition to being water- proofced, the Mk 51 Mod 5 MTF embodies the following refinements of design which either improve its operation or assure a greater degree of safety in handling.

1. Mod 5 has smaller weights on the centrifugal gears than the Mk 22.

2. The firing arm was hardened to increase reliability.

NAVORD OP 2215 VOLUME 1 SECOND R3ZVISION

3. A zero adjustor plate with a zero adjusting screw, permanently set at the time of manufacture, was added to the timing disk to afford greater precision of time setting. The zero adjustor plate also embodies a premature trap, a small notch within the slot of the plate. Malfunction of the escapement assembly or of the gear-and- pinion train might result in wild rotation of the timing disk. In such a case, this trap prevents the firing arm from completely engaging the timing disk and zero adjustor plate slots. This results in a dud instead of can early detonation.

4. The safety lever assembly of the escapement lever was shifted to the opposite end of the escapement lever, and redesigned. The safety lever assembly in the Mod 5 is normally held in the block position and then released at the proper instant by the setback pin instead of by safety lever spring. This arrangement is an improve- ment over the earlier spring-loaded safety lever in that it provides greater certainty of keeping the escapement lever blocked during rough handling of the fuze.

5. The design of the tensioning wire was modified so that both ends are now bent at an angle of about 90° and fitted into the hole drilled from the inside of the lower cap.

d. All mods of the Mk 51 function as follows for various settings. Settings 1 and 2 are not recommended; resultant actions are variable because of manufacturing tolerances.

SETTING (Sec.) ACTION

1. Safety zone to and including 0.4 Dud caused by built-in feature 2. Ow4 to 0.6 May be a dud or may function at between

0.6 and 0.8 seconds 3. 0.6 to 0.8 Functions at between 0.6 and 0.8 sec. 4. 0.8 to 30 Functions at time set plus or minus

allowable calibration error

3-11

-


4.335”


CENTRIFUGAL WEIGHT MAIN SPINDLE CENTRIFUGAL GEAR

Figure 3-8. Mechanical Time Fuze Mk 57 Mod 2, Centrifugal Gear Assembly

3-12

--

-

---

--

- --

--

Jsed in Projectiles 8"/55 AAC

LD 272859 Jrawing 863160

II-read Size (in.) Intrusion Depth (in.)

1.700-14NS-1 0.805

&era11 Length (in.) rJeight (lb.)

4.335 1.920

rime Delay (sec. max.) 45

Explosive Components: Primer Either F.A. 70 Primer

Mix or F.A. 70 Primer Mix modified to contain 8% groundglass




MK 57 MOD 2

3-9 MK 57 MTF. The Mk 57, figures 3-7 and 3-8, is similar to the typical MTF described in Appendix C. Mod 2 differs from the typical MTF in that it has a different external shape, with slots instead of lugs for setting; its

clockwork turns in a direction opposite to that of the typical fuze; and it employs the firing pin safety block instead of a setback pin. Its escapement gear has 20 teeth.

-

-

- 3-13

-

NAVORD OP 2215 VOW 1 SECOND REVISION

SAFETY DISK \ II I

- MAIN SPINDLE

--KICK-OFF SPRING

-SAFETY LEVER PLATE

Figure 3-9. Mechanical Time Fuze Mk 61 Mod 1, Cutaway View

08”

-

-.


3-14

NAVORD OP 2215 V0IJJMf.Z 1 SECOND REVISION

--

-

--

-

--

-

--

-

-

./?

-

3-10 MK 61 MTF. Mod 0 is identical to the typical MTF described in Appendix C. Mk 61 Mod 1, figure 3-9, is similar to the Mod 0 except for the use of heavier driving weights, a weighted escapement lever, and a 20- instead of X)-tooth splined escapement gear and splined pinion.

3-11 MK 62 MTF. Mk 62 fuzes are produced for assembly in major caliber projectiles having relatively slower rates of spin. They closely resemble the typical MTF described in Appendix C. The chief structural difference is a post under the hammer spring which prevents the hammers from moving aft until after the fuze is set. The post is part of the left spacer; it is turned free when the lower cap is rotated to the time setting. This feature prevents arming of the fuze in case it is dropped.

Mod 0 is almost identical to the 2 61 MTF but is slightly modified to allow its use in the major caliber projectiles, where extremely low setback force on firing is encountered. Mk 62-O differs from the Mk 61 in the following ways:

1. To prevent arming on accidental dropping of the fuze, a safety post has been placed under the harrrmer spring in the Mk 62.

2. The "kick-off" springs on the centrifugal weight are weaker. This design provides torque over a longer period and is necessitated by the lower spin rate of major caliber projectiles.

3. The escapement lever has been modified by the addition of small weights to enable a more efficient slowing down of the gear system.

4. In addition to having the weakened hammer spring, the lugs in

the timing disk have been weakened. This enables a weaker force of setback to act upon the hammer spring and forked lug assembly of the fuze.

b. Mod 1, figures 3-10 and 3-11, differs from Mod 0 in the following respects:

1. The firing-arm shaft has been hardened to afford greater certainty that the firing pin safety plate shall not accidentally slip past the groove in the firing arm and produce an early detonation.

2. A setback pin has been added as a safety feature. As the projectile is fired, this pin is moved aft by inertia acting against a restraining spring, unlocking the firing-arm shaft and 'the safety lever assembly.

3. A premature trap has been introduced as a further means of preventing an early detonation. This consists of a small notch in the slot of the zero adjuster plate. Should the clock mechanism and timing disk for any reason spin in uncontrolled fashion, this trap would catch the firing arm and prevent it from completely engaging the slot before the set time. This would result in a dud.

4. The escapement release system has been modified by the elimination of the safety lever plate, detent, and spring used on the earlier mod; and the substitution of a safety lever assembly locking in the unarmed condition by the setback pin. At the proper moment, the setback pin unlocks this assembly, allowing it to be moved out- ward by centrifugal force and to release the escapement lever. This in turn frees the clock movement to operate. In addition various design changes, such as elimination of the weights on the lever, have been made on the escapement assembly itself.

3-15


HAMMER SPRING

WEIGHT

POST

LEFT SPACER

SAFETY LEVER SPRING SAFETY LEVER PLATE

--

PIN

ADJUSTING NUTS

Figure 3-11. Details of Mechanical Time Fuze MYk 62 Mod 1; Post Under Hammer Spring (top) and Slider-Type Escapement Release (bottom)

3-16

--

-

K=

--

-

-

--

-1

-

- -

-

-

-

-

-



\sed in Projectiles

AD kawing

SK 165619 440479

SK 165255 165620 299386 561519 561996 1475151

l-read Size (in.) ntrusion Depth (in.)

1.700-14NS-1 0.803

1.700-14NS-1 0.803

1.700-14NS-1 0.803

1.700-14NS-1 0.803

)verall Length (in.) 4.308 4.308 4.308 4.308 [eight (lb.) 2.280 2.280 2.280 2.340

Yime Delay (sec. max.) 45 45 45 45

kplosive Components: Primer Either F.A. 70 Primer Mix or F.A. 70

Primer Mix modified to contain 8% Mk 104 Mod 0 Primer Mix No. 529 or F.A. 70 6 40 grains black powder

Booster

MK 61 42OD 0

5"/38 ILUJM and WP

MK 61 MOD 1

5"/38 AAC, HE-MT, ILLUM, and W-P

--- dK 62 $OD 0

16" HC

ground glass

Black Powder Black Powder Black Powder

MK 62 MOD 1

16" HC

Black Powder

WAFWNG

MTF Mk 61Mod 0 is used at full and reduced charge in 5"/38 ILLUM and WP projectiles. It should not be used at till or reduced charge in 5"/38 HE projectiles.

MTF Mk 61Mod 1 is used at full or reduced charge in 5"/38 HE, WP, or ILLUM projectiles.

3-17



3-12 MK 342 MTF. Mod 0, figure 3-12, is essentially a combination of the Mk 25Mod.s 4 and 5. The Mk 342 retains the same external characteristics as well as the same setback pin design employed in the Mk 25 Mod 5. In com- parison to the Mk 25 Mod 4, the Mk 342 is identical in that it retains the same centrifugal gear weight, drive spring, and safety block; and has the same moisture-proofing features, using thread sealant and varnish to seal the upper cap and bottom closing plug. Mod 1 is similar to and interchangeable with the Mod 0 fuze. Modifications to improve the reliability of the Mod 0 premature trap include changes in the timing disk assembly, zero adjusting plate, firing arm, and firing arm spring. To improve setting torque stability, a new six-wave beryl- lium copper torque spring has been installed.

a. Operation and Safety Features. The operational design and safety features of the Mk 342 are similar to those of the Mk 349 Mod 0 (see paragraph 3-13).

b. Time Firing Characteristics. The Mk 342 Mod 0 MTF functions as follows for the various settings:

Standard Setting Mean Burst Time Deviation (sec.) (sec.) (sec.)

10 40

Full Charge 9.841 to 10.159 0.167 Max. 39.718 to 40.282 0.362 Max.

10 40

Reduced Charge 10.341 to 10.659 0.167 Max. 40.218 to 40.782 0.362 Max.

MTF for

NOTE

Reports of malfunctions shall classify prematures occurring within 2000 feet as close aboard prematures. Those occurring beyond 2000 feet shall be-classified as bursts.

early

Mk 342 Mod 1 functions the various settings:

Setting Mean Burst Time (set .) (sec.)

Full Charge 9.800 to 10.200 39.656 to 40.344

10 40

Reduced Charge 10.050 to 10.450 40.156 to 40.844

-:

as :follows

Standard Deviation (sec. >

-

0.167 Max. 0.362 Max.

0.167 Max. 0.362 Max.

Moistureproofing. has i*moistureproof design

The Mk 342 intended to

give longer life and greater reliability. The moismreproofing is accomplished as follows:

1. Mk 342 MTF contains an internal desiccator unit of silica gel in the base cavit of the fuze body. This silica gel al sorbs and retains all moisture in the air trapped in the fuze at assembly, thus preventing rusting of steel parts or deterioration of explosive components.

--

3-18

~. -.--I

_ A- _

--

--

-

-

-

U

L D

'I I

C w

7

R

E


MK 342 MK 342 MOD 0 MOD 1 ----__ --

5"/54 AAC, HE-MT 8 ILLUM 'sed in Projectiles

D rawing

549675 2428426

l-read Size (in.) ntrusion Depth (in.)

Qerall Length (in.) 'eight (lb.)

1.700-14NS-1 0.803

4.581 1.410

'ime Delay (sec.) 0.8 (min.) to 45.0 (max.)

.equired Setting Torque (in. lb.) : losive Components: % imer (Percussion Cap)

70 - 140 (Rework only)

5"/54 AAC, HE-MT 6 ILLUM

2511237 2511237

1.700-14NS-1 0.803

4.581 1.450

1.0 (min.) to 45.0 (max.)

80 - 130

Either F.A. 70 Primer Mix consisting of potassium chlorate, antimony sulfide, TNT, and lead sulfocya- nate; F.A. 70 Primer Mix modified to contain 8% ground glass; or No. 529 Winchester Primer Mix, 0.44 grams.

Booster Black Powder Black Powder

NAt'oRD OP 2215 VOLUME 1 I SECOND REVISION

1

2. The joint between the upper and lower caps is coated externally with thread sealant and varnish. This film of varnish is practically impervious to moisture, hence serves as a mechanical barrier to its passage.

3. The primer screw assembly is moistureproofed by inserting a vinylite disk under the black po&er relay pellet and by coating both ends of the primer screw assembly with Bakelite varnish.

4. Thread sealant is applied to the joint between the body and the bottom closing screw, serving to exclude moisture and keep the joint mechanically tight. The brass disk at the center of the bottom closing screw is crimped in under a washer, then coated with Bakelite varnish.

d. Markings on Fuze. MTF Mk 342 Mod 0 or 1, (Initials of Manufacturer and of Navy Inspector and Lot Number).

3-19

NAVORD OP 2215 VOLUME 1: SECOND REVISION : ;

-.-


3-20

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